900 (nine hundred) is the

natural number In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and ordering (as in "this is the ''third'' largest city in the country"). Numbers used for counting are called '' cardinal ...

following

899 __NOTOC__ Year 899 ( DCCCXCIX) was a common year starting on Monday (link will display the full calendar) of the Julian calendar. Events By place Europe * Summer – King Arnulf of Carinthia enlists the support of the Magyars, to ra ...

and preceding

901 __NOTOC__ Year 901 ( CMI) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar. Events By place Europe * February – King Louis III (the Blind) is crowned as Holy Roman Emperor by ...

. It is the

square In Euclidean geometry, a square is a regular quadrilateral, which means that it has four equal sides and four equal angles (90- degree angles, π/2 radian angles, or right angles). It can also be defined as a rectangle with two equal-length a ...

of 30 and the sum of

Euler's totient function In number theory, Euler's totient function counts the positive integers up to a given integer that are relatively prime to . It is written using the Greek letter phi as \varphi(n) or \phi(n), and may also be called Euler's phi function. In ...

for the first 54

positive integer In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and ordering (as in "this is the ''third'' largest city in the country"). Numbers used for counting are called '' cardinal ...

s. In base 10 it is a

Harshad number In mathematics, a harshad number (or Niven number) in a given number base is an integer that is divisible by the sum of its digits when written in that base. Harshad numbers in base are also known as -harshad (or -Niven) numbers. Harshad number ...

. It is also the first number to be the square of a sphenic number.

In other fields

900 is also: * A telephone

area code A telephone numbering plan is a type of numbering scheme used in telecommunication to assign telephone numbers to subscriber telephones or other telephony endpoints. Telephone numbers are the addresses of participants in a telephone network, r ...

for "premium" phone calls in the

North American Numbering Plan The North American Numbering Plan (NANP) is a telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1 and has the international calling ...

* In Greek number symbols, the sign

Sampi Sampi (modern: ϡ; ancient shapes: , ) is an archaic letter of the Greek alphabet. It was used as an addition to the classical 24-letter alphabet in some eastern Ionic dialects of ancient Greek in the 6th and 5th centuries BC, to denote some t ...

("ϡ", literally "like a pi") * A

skateboarding trick A skateboarding trick, or simply a trick, is a maneuver performed by manipulating a skateboard, usually with one's feet, in a specific way to achieve the desired outcome – the trick. History Though skateboards emerged in the 1900s, skateboar ...

in which the skateboarder spins two and a half times (360 degrees times 2.5 is 900) * A

900 series 900 series or series 900 or ''variation'', may refer to: * 900 series (bowling), three consecutive perfect games by an individual bowler * AMD 900 chipset series, set of chipsets released in 2011 * Euskotren 900 series, a train type * GeForce 900 ...

refers to three consecutive

perfect games Perfect game may refer to: Sports * Perfect game (baseball), a complete-game win by a pitcher allowing no baserunners * Perfect game (bowling), a 300 game, 12 consecutive strikes in the same game * Perfect Game Collegiate Baseball League, New York ...

bowling Bowling is a target sport and recreational activity in which a player rolls a ball toward pins (in pin bowling) or another target (in target bowling). The term ''bowling'' usually refers to pin bowling (most commonly ten-pin bowling), though ...

* Yoda's age in

Star Wars ''Star Wars'' is an American epic space opera multimedia franchise created by George Lucas, which began with the eponymous 1977 film and quickly became a worldwide pop-culture phenomenon. The franchise has been expanded into various film ...

Integers from 901 to 999

900s

* 901 = 17 × 53,

centered triangular number A centered (or centred) triangular number is a centered figurate number that represents an equilateral triangle with a dot in the center and all its other dots surrounding the center in successive equilateral triangular layers. The followin ...

happy number In number theory, a happy number is a number which eventually reaches 1 when replaced by the sum of the square of each digit. For instance, 13 is a happy number because 1^2+3^2=10, and 1^2+0^2=1. On the other hand, 4 is not a happy number because ...

* 902 = 2 × 11 × 41,

sphenic number In number theory, a sphenic number (from grc, σφήνα, 'wedge') is a positive integer that is the product of three distinct prime numbers. Because there are infinitely many prime numbers, there are also infinitely many sphenic numbers. Definit ...

nontotient In number theory, a nontotient is a positive integer ''n'' which is not a totient number: it is not in the range of Euler's totient function φ, that is, the equation φ(''x'') = ''n'' has no solution ''x''. In other words, ''n'' is a nontotien ...

, Harshad number * 903 = 3 × 7 × 43, sphenic number, triangular number,

Schröder–Hipparchus number In combinatorics, the Schröder–Hipparchus numbers form an integer sequence that can be used to count the number of plane trees with a given set of leaves, the number of ways of inserting parentheses into a sequence, and the number of ways of d ...

Mertens function In number theory, the Mertens function is defined for all positive integers ''n'' as : M(n) = \sum_^n \mu(k), where \mu(k) is the Möbius function. The function is named in honour of Franz Mertens. This definition can be extended to positive re ...

(903) returns 0, little Schroeder number * 904 = 2³ × 113 or 113 × 8, Mertens function(904) returns 0, lazy caterer number, number of 1's in all partitions of 26 into odd parts * 905 = 5 × 181, sum of seven consecutive primes (109 + 113 + 127 + 131 + 137 + 139 + 149), smallest composite de Polignac number ** "The 905" is a common nickname for the suburban portions of the

Greater Toronto Area The Greater Toronto Area, commonly referred to as the GTA, includes the City of Toronto and the regional municipalities of Durham, Halton, Peel, and York. In total, the region contains 25 urban, suburban, and rural municipalities. The Greater ...

in Canada, a region whose telephones used

area code 905 Area is the quantity that expresses the extent of a region on the plane or on a curved surface. The area of a plane region or ''plane area'' refers to the area of a shape or planar lamina, while ''surface area'' refers to the area of an open s ...

before

overlay plan Overlay may refer to: Computers * Overlay network, a computer network which is built on top of another network * Hardware overlay, one type of video overlay that uses memory dedicated to the application *Another term for exec, replacing one proce ...

s added two more area codes. * 906 = 2 × 3 × 151, strobogrammatic, sphenic number, Mertens function(906) returns 0 * 907 = prime number * 908 = 2² × 227, nontotient, number of primitive sorting networks on 6 elements, number of rhombic tilings of a 12-gon * 909 = 3² × 101, number of non-isomorphic aperiodic multiset partitions of weight 7

910s

* 910 = 2 × 5 × 7 × 13, Mertens function(910) returns 0, Harshad number,

, balanced number, number of polynomial symmetric functions of matrix of order 7 under separate row and column permutations *

911 911 or 9/11 may refer to: Dates * AD 911 * 911 BC * September 11 ** 9/11, the September 11 attacks of 2001 ** 11 de Septiembre, Chilean coup d'état in 1973 that outed the democratically elected Salvador Allende * November 9 Numbers * 911 ...

Sophie Germain Marie-Sophie Germain (; 1 April 1776 – 27 June 1831) was a French mathematician, physicist, and philosopher. Despite initial opposition from her parents and difficulties presented by society, she gained education from books in her father's lib ...

prime number, also the

emergency telephone number Most public switched telephone networks have a single emergency telephone number (sometimes known as the universal emergency telephone number or the emergency services number) that allows a caller to contact local emergency services for assis ...

in North America * 912 = 2⁴ × 3 × 19, sum of four consecutive primes (223 + 227 + 229 + 233), sum of ten consecutive primes (71 + 73 + 79 + 83 + 89 + 97 + 101 + 103 + 107 + 109), Harshad number. * 913 = 11 × 83,

Smith number In number theory, a Smith number is a composite number for which, in a given number base, the sum of its digits is equal to the sum of the digits in its prime factorization in the given number base. In the case of numbers that are not square-f ...

, Mertens function(913) returns 0. * 914 = 2 × 457, nontotient, number of compositions of 11 that are neither weakly increasing nor weakly decreasing * 915 = 3 × 5 × 61, sphenic number, Smith number, Mertens function(915) returns 0, Harshad number * 916 = 2² × 229, Mertens function(916) returns 0, nontotient, strobogrammatic, member of the

Mian–Chowla sequence In mathematics, the Mian–Chowla sequence is an integer sequence defined recursively in the following way. The sequence starts with :a_1 = 1. Then for n>1, a_n is the smallest integer such that every pairwise sum :a_i + a_j is distinct, for ...

* 917 = 7 × 131, sum of five consecutive primes (173 + 179 + 181 + 191 + 193) * 918 = 2 × 3³ × 17, Harshad number * 919 = prime number,

cuban prime A cuban prime is a prime number that is also a solution to one of two different specific equations involving differences between third powers of two integers ''x'' and ''y''. First series This is the first of these equations: :p = \frac,\ x = ...

, prime index prime,

Chen prime A prime number ''p'' is called a Chen prime if ''p'' + 2 is either a prime or a product of two primes (also called a semiprime). The even number 2''p'' + 2 therefore satisfies Chen's theorem. The Chen primes are named after Chen Jingru ...

palindromic prime In mathematics, a palindromic prime (sometimes called a palprime) is a prime number that is also a palindromic number. Palindromicity depends on the Radix, base of the number system and its notational conventions, while primality is independent of ...

centered hexagonal number In mathematics and combinatorics, a centered hexagonal number, or hex number, is a centered figurate number that represents a hexagon with a dot in the center and all other dots surrounding the center dot in a hexagonal lattice. The following ...

, Mertens function(919) returns 0

920s

* 920 = 2³ × 5 × 23, Mertens function(920) returns 0, total number of nodes in all rooted trees with 8 nodes * 921 = 3 × 307, number of enriched r-trees of size 7 * 922 = 2 × 461, nontotient, Smith number * 923 = 13 × 71, number of combinations of 6 things from 1 to 6 at a time * 924 = 2² × 3 × 7 × 11, sum of a twin prime (461 + 463),

central binomial coefficient In mathematics the ''n''th central binomial coefficient is the particular binomial coefficient : = \frac = \prod\limits_^\frac \textn \geq 0. They are called central since they show up exactly in the middle of the even-numbered rows in Pascal' ...

\tbinom  6

* 925 = 5² × 37,

pentagonal number A pentagonal number is a figurate number that extends the concept of triangular and square numbers to the pentagon, but, unlike the first two, the patterns involved in the construction of pentagonal numbers are not rotationally symmetrical. The ...

centered square number In elementary number theory, a centered square number is a centered figurate number that gives the number of dots in a square with a dot in the center and all other dots surrounding the center dot in successive square layers. That is, each cen ...

** The

millesimal fineness The fineness of a precious metal object (coin, bar, jewelry, etc.) represents the weight of ''fine metal'' therein, in proportion to the total weight which includes alloying base metals and any impurities. Alloy metals are added to increase hardne ...

number for

Sterling silver Sterling silver is an alloy of silver containing 92.5% by weight of silver and 7.5% by weight of other metals, usually copper. The sterling silver standard has a minimum millesimal fineness of 925. '' Fine silver'', which is 99.9% pure silver, i ...

* 926 = 2 × 463, sum of six consecutive primes (139 + 149 + 151 + 157 + 163 + 167), nontotient * 927 = 3² × 103, tribonacci number * 928 = 2⁵ × 29, sum of four consecutive primes (227 + 229 + 233 + 239), sum of eight consecutive primes (101 + 103 + 107 + 109 + 113 + 127 + 131 + 137),

* 929 = prime number,

Proth prime A Proth number is a natural number ''N'' of the form N = k \times 2^n +1 where ''k'' and ''n'' are positive integers, ''k'' is odd and 2^n > k. A Proth prime is a Proth number that is prime. They are named after the French mathematician François ...

, palindromic prime, sum of nine consecutive primes (83 + 89 + 97 + 101 + 103 + 107 + 109 + 113 + 127),

Eisenstein prime In mathematics, an Eisenstein prime is an Eisenstein integer : z = a + b\,\omega, \quad \text \quad \omega = e^, that is irreducible (or equivalently prime) in the ring-theoretic sense: its only Eisenstein divisors are the units , itself ...

with no imaginary part ** An area code in New York.

930s

* 930 = 2 × 3 × 5 × 31,

pronic number A pronic number is a number that is the product of two consecutive integers, that is, a number of the form n(n+1).. The study of these numbers dates back to Aristotle. They are also called oblong numbers, heteromecic numbers,. or rectangular number ...

* 931 = 7² × 19; sum of three consecutive primes (307 + 311 + 313); double

repdigit In recreational mathematics, a repdigit or sometimes monodigit is a natural number composed of repeated instances of the same digit in a positional number system (often implicitly decimal). The word is a portmanteau of repeated and digit. Example ...

, 111₃₀ and 777₁₁; number of regular simple graphs spanning 7 vertices * 932 = 2² × 233, number of regular simple graphs on 7 labeled nodes * 933 = 3 × 311 * 934 = 2 × 467, nontotient * 935 = 5 × 11 × 17, sphenic number, Lucas–Carmichael number, Harshad number * 936 = 2³ × 3² × 13,

pentagonal pyramidal number A pyramidal number is a figurate number that represents a pyramid with a polygonal base and a given number of triangular sides. A pyramidal number is the number of points in a pyramid where each layer of the pyramid is an -sided polygon of points. ...

, Harshad number * 937 = prime number, Chen prime, star number,

* 938 = 2 × 7 × 67, sphenic number, nontotient, number of lines through at least 2 points of an 8 × 8 grid of points * 939 = 3 × 313, number of V-toothpicks after 31 rounds of the honeycomb sequence

940s

* 940 = 2² × 5 × 47, totient sum for first 55 integers * 941 = prime number, sum of three consecutive primes (311 + 313 + 317), sum of five consecutive primes (179 + 181 + 191 + 193 + 197), Chen prime, Eisenstein prime with no imaginary part * 942 = 2 × 3 × 157, sphenic number, sum of four consecutive primes (229 + 233 + 239 + 241), nontotient, convolved Fibonacci number * 943 = 23 × 41 * 944 = 2⁴ × 59, nontotient, Lehmer-Comtet number * 945 = 3³ × 5 × 7,

double factorial In mathematics, the double factorial or semifactorial of a number , denoted by , is the product of all the integers from 1 up to that have the same parity (odd or even) as . That is, :n!! = \prod_^ (n-2k) = n (n-2) (n-4) \cdots. For even , the ...

of 9, smallest odd

abundant number In number theory, an abundant number or excessive number is a number for which the sum of its proper divisors is greater than the number. The integer 12 is the first abundant number. Its proper divisors are 1, 2, 3, 4 and 6 for a total of 16. Th ...

(divisors less than itself add up to 975); smallest odd

primitive abundant number In mathematics a primitive abundant number is an abundant number whose proper divisors are all deficient numbers. For example, 20 is a primitive abundant number because: :#The sum of its proper divisors is 1 + 2 + 4 + 5 + 10 = 22, so 20 is an abu ...

; smallest odd

primitive semiperfect number Primitive may refer to: Mathematics * Primitive element (field theory) * Primitive element (finite field) * Primitive cell (crystallography) * Primitive notion, axiomatic systems * Primitive polynomial (disambiguation), one of two concepts * Primi ...

;

Leyland number In number theory, a Leyland number is a number of the form :x^y + y^x where ''x'' and ''y'' are integers greater than 1. They are named after the mathematician Paul Leyland. The first few Leyland numbers are : 8, 17, 32, 54, 57, 100, 145, 17 ...

* 946 = 2 × 11 × 43, sphenic number, triangular number,

hexagonal number A hexagonal number is a figurate number. The ''n''th hexagonal number ''h'n'' is the number of ''distinct'' dots in a pattern of dots consisting of the ''outlines'' of regular hexagons with sides up to n dots, when the hexagons are overlaid so ...

* 947 = prime number, sum of seven consecutive primes (113 + 127 + 131 + 137 + 139 + 149 + 151),

balanced prime In number theory, a balanced prime is a prime number with equal-sized prime gaps above and below it, so that it is equal to the arithmetic mean of the nearest primes above and below. Or to put it algebraically, given a prime number p_n, where is it ...

, lazy caterer number,

with no imaginary part * 948 = 2² × 3 × 79, nontotient, forms a Ruth–Aaron pair with 949 under second definition, number of combinatory separations of normal multisets of weight 6. * 949 = 13 × 73, forms a Ruth–Aaron pair with 948 under second definition

950s

* 950 = 2 × 5² × 19, nontotient, generalized pentagonal number ** one of two

ISBN The International Standard Book Number (ISBN) is a numeric commercial book identifier that is intended to be unique. Publishers purchase ISBNs from an affiliate of the International ISBN Agency. An ISBN is assigned to each separate edition a ...

Group Identifiers for books published in

Argentina Argentina (), officially the Argentine Republic ( es, link=no, República Argentina), is a country in the southern half of South America. Argentina covers an area of , making it the List of South American countries by area, second-largest ...

* 951 = 3 × 317,

centered pentagonal number A centered pentagonal number is a centered figurate number that represents a pentagon with a dot in the center and all other dots surrounding the center in successive pentagonal layers. The centered pentagonal number for ''n'' is given by th ...

** one of two ISBN Group Identifiers for books published in Finland * 952 = 2³ × 7 × 17, number of reduced words of length 3 in the Weyl group D_17, number of regions in regular tetradecagon with all diagonals drawn. ** 952 is also '' 9-5-2,'' a

card game A card game is any game using playing cards as the primary device with which the game is played, be they traditional or game-specific. Countless card games exist, including families of related games (such as poker). A small number of card ga ...

similar to

bridge A bridge is a structure built to span a physical obstacle (such as a body of water, valley, road, or rail) without blocking the way underneath. It is constructed for the purpose of providing passage over the obstacle, which is usually someth ...

. ** one of two ISBN Group Identifiers for books published in Finland * 953 = prime number, Sophie Germain prime, Chen prime, Eisenstein prime with no imaginary part,

centered heptagonal number A centered heptagonal number is a centered figurate number that represents a heptagon with a dot in the center and all other dots surrounding the center dot in successive heptagonal layers. The centered heptagonal number for ''n'' is given by ...

** ISBN Group Identifier for books published in

Croatia , image_flag = Flag of Croatia.svg , image_coat = Coat of arms of Croatia.svg , anthem = " Lijepa naša domovino"("Our Beautiful Homeland") , image_map = , map_caption = , capi ...

* 954 = 2 × 3² × 53, sum of ten consecutive primes (73 + 79 + 83 + 89 + 97 + 101 + 103 + 107 + 109 + 113), nontotient, Harshad number, sixth derivative of x^(x^x) at x=1. ** ISBN Group Identifier for books published in Bulgaria. Also one of the

Area Codes A telephone numbering plan is a type of numbering scheme used in telecommunication to assign telephone numbers to subscriber telephones or other telephony endpoints. Telephone numbers are the addresses of participants in a telephone network, r ...

in the

South Florida South Florida is the southernmost region of the U.S. state of Florida. It is one of Florida's three most commonly referred to directional regions; the other two are Central Florida and North Florida. South Florida is the southernmost part of ...

Area * 955 = 5 × 191, number of transitive rooted trees with 17 nodes ** ISBN Group Identifier for books published in Sri Lanka * 956 = 2² × 239, number of compositions of 13 into powers of 2. ** ISBN Group Identifier for books published in Chile * 957 = 3 × 11 × 29, sphenic number, antisigma(45) ** one of two ISBN Group Identifiers for books published in Taiwan and China * 958 = 2 × 479, nontotient,

** ISBN Group Identifier for books published in

Colombia Colombia (, ; ), officially the Republic of Colombia, is a country in South America with insular regions in North America—near Nicaragua's Caribbean coast—as well as in the Pacific Ocean. The Colombian mainland is bordered by the ...

** The

number for

Britannia silver Britannia silver is an alloy of silver containing 11 ozt 10 dwt (i.e. 11½ troy oz.) silver in the pound troy, equivalent to , or 95.833% by weight (mass) silver, the rest usually being copper. This standard was introduced in England by Act of ...

* 959 = 7 × 137, composite de Polignac number ** ISBN Group Identifier for books published in Cuba

960s

* 960 = 2⁶ × 3 × 5, sum of six consecutive primes (149 + 151 + 157 + 163 + 167 + 173), Harshad number ** country calling code for Maldives, ISBN Group Identifier for books published in Greece ** The number of possible starting positions for the

chess variant A chess variant is a game related to, derived from, or inspired by chess. Such variants can differ from chess in many different ways. "International" or "Western" chess itself is one of a family of games which have related origins and could be co ...

Chess960 Fischer random chess, also known as Chess960 (often read in this context as 'chess nine-sixty' instead of 'chess nine hundred sixty'), is a variation of the game of chess invented by the former world chess champion Bobby Fischer. Fischer anno ...

* 961 = 31², the largest 3-digit perfect square, sum of three consecutive primes (313 + 317 + 331), sum of five consecutive primes (181 + 191 + 193 + 197 + 199),

centered octagonal number A centered octagonal number is a centered figurate number that represents an octagon with a dot in the center and all other dots surrounding the center dot in successive octagonal layers.. The centered octagonal numbers are the same as the od ...

** country calling code for Lebanon, ISBN Group Identifier for books published in

Slovenia Slovenia ( ; sl, Slovenija ), officially the Republic of Slovenia (Slovene: , abbr.: ''RS''), is a country in Central Europe. It is bordered by Italy to the west, Austria to the north, Hungary to the northeast, Croatia to the southeast, and ...

* 962 = 2 × 13 × 37, sphenic number, nontotient ** country calling code for Jordan, one of two ISBN Group Identifiers for books published in Hong Kong * 963 = 3² × 107, sum of the first twenty-four primes ** country calling code for Syria, ISBN Group Identifier for books published in Hungary * 964 = 2² × 241, sum of four consecutive primes (233 + 239 + 241 + 251), nontotient, totient sum for first 56 integers ** country calling code for Iraq, ISBN Group Identifier for books published in Iran,

* 965 = 5 × 193 ** country calling code for Kuwait, ISBN Group Identifier for books published in Israel * 966 = 2 × 3 × 7 × 23 =

\left\

, sum of eight consecutive primes (103 + 107 + 109 + 113 + 127 + 131 + 137 + 139), Harshad number ** country calling code for Saudi Arabia, one of two ISBN Group Identifiers for books published in Ukraine * 967 = prime number, prime index prime ** country calling code for Yemen, one of two ISBN Group Identifiers for books published in Malaysia * 968 = 2³ × 11², nontotient,

Achilles number An Achilles number is a number that is powerful but not a perfect power. A positive integer is a powerful number if, for every prime factor of , is also a divisor. In other words, every prime factor appears at least squared in the factori ...

, area of a square with diagonal 44 ** country calling code for Oman, one of two ISBN Group Identifiers for books published in Mexico * 969 = 3 × 17 × 19, sphenic number, nonagonal number,

tetrahedral number A tetrahedral number, or triangular pyramidal number, is a figurate number that represents a pyramid with a triangular base and three sides, called a tetrahedron. The th tetrahedral number, , is the sum of the first triangular numbers, that is, ...

** ISBN Group Identifier for books published in Pakistan, age of

Methuselah Methuselah () ( he, מְתוּשֶׁלַח ''Məṯūšélaḥ'', in pausa ''Məṯūšālaḥ'', "His death shall send" or "Man of the javelin" or "Death of Sword"; gr, Μαθουσάλας ''Mathousalas'') was a biblical patriarch and a f ...

according to Old Testament, anti-Muslim movement in Myanmar

970s

* 970 = 2 × 5 × 97, sphenic number, heptagonal number ** country calling code for Palestinian territories, one of two ISBN Group Identifiers for books published in Mexico *

971 Year 971 ( CMLXXI) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. Events By place Byzantine Empire * Battle of Dorostolon: A Byzantine expeditionary army (possibly 30–40,000 men ...

= prime number, Chen prime, Eisenstein prime with no imaginary part ** country calling code for United Arab Emirates, ISBN Group Identifier for books published in the Philippines * 972 = 2² × 3⁵, Harshad number,

** country calling code for Israel, one of two ISBN Group Identifiers for books published in Portugal * 973 = 7 × 139,

** country calling code for Bahrain, ISBN Group Identifier for books published in Romania, * 974 = 2 × 487, nontotient, 974! - 1 is prime ** country calling code for Qatar, ISBN Group Identifier for books published in Thailand * 975 = 3 × 5² × 13 ** country calling code for Bhutan, ISBN Group Identifier for books published in Turkey * 976 = 2⁴ × 61,

decagonal number A decagonal number is a figurate number that extends the concept of triangular and square numbers to the decagon (a ten-sided polygon). However, unlike the triangular and square numbers, the patterns involved in the construction of decagonal number ...

** country calling code for Mongolia, ISBN Group Identifier for books published in

Antigua Antigua ( ), also known as Waladli or Wadadli by the native population, is an island in the Lesser Antilles. It is one of the Leeward Islands in the Caribbean region and the main island of the country of Antigua and Barbuda. Antigua and Bar ...

Bahamas The Bahamas (), officially the Commonwealth of The Bahamas, is an island country within the Lucayan Archipelago of the West Indies in the North Atlantic. It takes up 97% of the Lucayan Archipelago's land area and is home to 88% of the a ...

Barbados Barbados is an island country in the Lesser Antilles of the West Indies, in the Caribbean region of the Americas, and the most easterly of the Caribbean Islands. It occupies an area of and has a population of about 287,000 (2019 estima ...

Belize Belize (; bzj, Bileez) is a Caribbean and Central American country on the northeastern coast of Central America. It is bordered by Mexico to the north, the Caribbean Sea to the east, and Guatemala to the west and south. It also shares a wa ...

Cayman Islands The Cayman Islands () is a self-governing British Overseas Territory—the largest by population in the western Caribbean Sea. The territory comprises the three islands of Grand Cayman, Cayman Brac and Little Cayman, which are located to the ...

Dominica Dominica ( or ; Kalinago: ; french: Dominique; Dominican Creole French: ), officially the Commonwealth of Dominica, is an island country in the Caribbean. The capital, Roseau, is located on the western side of the island. It is geographical ...

Grenada Grenada ( ; Grenadian Creole French: ) is an island country in the West Indies in the Caribbean Sea at the southern end of the Grenadines island chain. Grenada consists of the island of Grenada itself, two smaller islands, Carriacou and Pet ...

Guyana Guyana ( or ), officially the Cooperative Republic of Guyana, is a country on the northern mainland of South America. Guyana is an indigenous word which means "Land of Many Waters". The capital city is Georgetown. Guyana is bordered by the ...

Jamaica Jamaica (; ) is an island country situated in the Caribbean Sea. Spanning in area, it is the third-largest island of the Greater Antilles and the Caribbean (after Cuba and Hispaniola). Jamaica lies about south of Cuba, and west of Hispa ...

Montserrat Montserrat ( ) is a British Overseas Territory in the Caribbean. It is part of the Leeward Islands, the northern portion of the Lesser Antilles chain of the West Indies. Montserrat is about long and wide, with roughly of coastline. It is n ...

Saint Kitts and Nevis Saint Kitts and Nevis (), officially the Federation of Saint Christopher and Nevis, is an island country and microstate consisting of the two islands of Saint Kitts and Nevis, both located in the West Indies, in the Leeward Islands chain ...

, St. Lucia, St. Vincent and the Grenadines,

Trinidad and Tobago Trinidad and Tobago (, ), officially the Republic of Trinidad and Tobago, is the southernmost island country in the Caribbean. Consisting of the main islands Trinidad and Tobago, and numerous much smaller islands, it is situated south of ...

, and the

British Virgin Islands ) , anthem = "God Save the King" , song_type = Territorial song , song = "Oh, Beautiful Virgin Islands" , image_map = File:British Virgin Islands on the globe (Americas centered).svg , map_caption = , mapsize = 290px , image_map2 = Brit ...

* 977 = prime number, sum of nine consecutive primes (89 + 97 + 101 + 103 + 107 + 109 + 113 + 127 + 131), balanced prime, Chen prime, Eisenstein prime with no imaginary part,

Stern prime A Stern prime, named for Moritz Abraham Stern, is a prime number that is not the sum of a smaller prime and twice the square of a non zero integer. That is, if for a prime ''q'' there is no smaller prime ''p'' and nonzero integer ''b'' such that ...

, strictly non-palindromic number ** country calling code for Nepal ** EAN prefix for

ISSN An International Standard Serial Number (ISSN) is an eight-digit serial number used to uniquely identify a serial publication, such as a magazine. The ISSN is especially helpful in distinguishing between serials with the same title. ISSNs a ...

s ** ISBN Group Identifier for books published in

Egypt Egypt ( ar, مصر , ), officially the Arab Republic of Egypt, is a List of transcontinental countries, transcontinental country spanning the North Africa, northeast corner of Africa and Western Asia, southwest corner of Asia via a land bridg ...

* 978 = 2 × 3 × 163, sphenic number, nontotient, number of secondary structures of RNA molecules with 11 nucleotides ** First EAN prefix for ISBNs ** ISBN Group Identifier for books published in

Nigeria Nigeria ( ), , ig, Naìjíríyà, yo, Nàìjíríà, pcm, Naijá , ff, Naajeeriya, kcg, Naijeriya officially the Federal Republic of Nigeria, is a country in West Africa. It is situated between the Sahel to the north and the Gulf o ...

* 979 = 11 × 89, the sum of the five smallest fourth powers:

979=\sum_^n^4

** Second EAN prefix for ISBNs. Also for ISMNs ** ISBN Group Identifier for books published in

Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania between the Indian and Pacific oceans. It consists of over 17,000 islands, including Sumatra, Java, Sulawesi, and parts of Borneo and New Gui ...

980s

* 980 = 2² × 5 × 7², number of ways to tile a hexagon of edge 3 wit
calissons
of side 1. ** ISBN Group Identifier for books published in

Venezuela Venezuela (; ), officially the Bolivarian Republic of Venezuela ( es, link=no, República Bolivariana de Venezuela), is a country on the northern coast of South America, consisting of a continental landmass and many islands and islets in th ...

* 981 = 3² × 109 ** one of two ISBN Group Identifiers for books published in

Singapore Singapore (), officially the Republic of Singapore, is a sovereign island country and city-state in maritime Southeast Asia. It lies about one degree of latitude () north of the equator, off the southern tip of the Malay Peninsula, bor ...

* 982 = 2 × 491,

** ISBN Group Identifier for books published in the

Cook Islands ) , image_map = Cook Islands on the globe (small islands magnified) (Polynesia centered).svg , capital = Avarua , coordinates = , largest_city = Avarua , official_languages = , lan ...

Fiji Fiji ( , ,; fj, Viti, ; Fiji Hindi: फ़िजी, ''Fijī''), officially the Republic of Fiji, is an island country in Melanesia, part of Oceania in the South Pacific Ocean. It lies about north-northeast of New Zealand. Fiji consis ...

Kiribati Kiribati (), officially the Republic of Kiribati ( gil, ibaberikiKiribati),Kiribati
''The Wor ...

Marshall Islands The Marshall Islands ( mh, Ṃajeḷ), officially the Republic of the Marshall Islands ( mh, Aolepān Aorōkin Ṃajeḷ),'' () is an independent island country and microstate near the Equator in the Pacific Ocean, slightly west of the Inte ...

Micronesia Micronesia (, ) is a subregion of Oceania, consisting of about 2,000 small islands in the western Pacific Ocean. It has a close shared cultural history with three other island regions: the Philippines to the west, Polynesia to the east, ...

Nauru Nauru ( or ; na, Naoero), officially the Republic of Nauru ( na, Repubrikin Naoero) and formerly known as Pleasant Island, is an island country and microstate in Oceania, in the Central Pacific. Its nearest neighbour is Banaba Island in ...

New Caledonia ) , anthem = "" , image_map = New Caledonia on the globe (small islands magnified) (Polynesia centered).svg , map_alt = Location of New Caledonia , map_caption = Location of New Caledonia , mapsize = 290px , subdivision_type = Sovereign st ...

Niue Niue (, ; niu, Niuē) is an island country in the South Pacific Ocean, northeast of New Zealand. Niue's land area is about and its population, predominantly Polynesian, was about 1,600 in 2016. Niue is located in a triangle between T ...

Palau Palau,, officially the Republic of Palau and historically ''Belau'', ''Palaos'' or ''Pelew'', is an island country and microstate in the western Pacific. The nation has approximately 340 islands and connects the western chain of the ...

Solomon Islands Solomon Islands is an island country consisting of six major islands and over 900 smaller islands in Oceania, to the east of Papua New Guinea and north-west of Vanuatu. It has a land area of , and a population of approx. 700,000. Its capit ...

Tokelau Tokelau (; ; known previously as the Union Islands, and, until 1976, known officially as the Tokelau Islands) is a dependent territory of New Zealand in the southern Pacific Ocean. It consists of three tropical coral atolls: Atafu, Nukunonu, a ...

Tonga Tonga (, ; ), officially the Kingdom of Tonga ( to, Puleʻanga Fakatuʻi ʻo Tonga), is a Polynesian country and archipelago. The country has 171 islands – of which 45 are inhabited. Its total surface area is about , scattered over in ...

Tuvalu Tuvalu ( or ; formerly known as the Ellice Islands) is an island country and microstate in the Polynesian subregion of Oceania in the Pacific Ocean. Its islands are situated about midway between Hawaii and Australia. They lie east-northea ...

Vanuatu Vanuatu ( or ; ), officially the Republic of Vanuatu (french: link=no, République de Vanuatu; bi, Ripablik blong Vanuatu), is an island country located in the South Pacific Ocean. The archipelago, which is of volcanic origin, is east of ...

Western Samoa Samoa, officially the Independent State of Samoa; sm, Sāmoa, and until 1997 known as Western Samoa, is a Polynesian island country consisting of two main islands ( Savai'i and Upolu); two smaller, inhabited islands ( Manono and Apolima); ...

* 983 = prime number,

safe prime In number theory, a prime number ''p'' is a if 2''p'' + 1 is also prime. The number 2''p'' + 1 associated with a Sophie Germain prime is called a . For example, 11 is a Sophie Germain prime and 2 × 11 + ...

, Chen prime, Eisenstein prime with no imaginary part,

Wedderburn–Etherington number The Wedderburn–Etherington numbers are an integer sequence named for Ivor Malcolm Haddon Etherington.. and Joseph Wedderburn. that can be used to count certain kinds of binary trees. The first few numbers in the sequence are :0, 1, 1, 1, 2, 3, ...

, strictly non-palindromic number ** One of two ISBN Group Identifiers for books published in

Malaysia Malaysia ( ; ) is a country in Southeast Asia. The federal constitutional monarchy consists of thirteen states and three federal territories, separated by the South China Sea into two regions: Peninsular Malaysia and Borneo's East Mal ...

* 984 = 2³ × 3 × 41 ** ISBN Group Identifier for books published in

Bangladesh Bangladesh (}, ), officially the People's Republic of Bangladesh, is a country in South Asia. It is the eighth-most populous country in the world, with a population exceeding 165 million people in an area of . Bangladesh is among the mo ...

* 985 = 5 × 197, sum of three consecutive primes (317 + 331 + 337),

Markov number A Markov number or Markoff number is a positive integer ''x'', ''y'' or ''z'' that is part of a solution to the Markov Diophantine equation :x^2 + y^2 + z^2 = 3xyz,\, studied by . The first few Markov numbers are : 1, 2, 5, 13, 29, 34, 89 ...

Pell number In mathematics, the Pell numbers are an infinite sequence of integers, known since ancient times, that comprise the denominators of the closest rational approximations to the square root of 2. This sequence of approximations begins , , , , an ...

, Smith number ** one of two ISBN Group Identifiers for books published in

Belarus Belarus,, , ; alternatively and formerly known as Byelorussia (from Russian ). officially the Republic of Belarus,; rus, Республика Беларусь, Respublika Belarus. is a landlocked country in Eastern Europe. It is bordered by ...

* 986 = 2 × 17 × 29, sphenic number, nontotient, strobogrammatic, number of unimodal compositions of 14 where the maximal part appears once ** one of two ISBN Group Identifiers for books published in Taiwan and China * 987 = 3 × 7 × 47,

Fibonacci number In mathematics, the Fibonacci numbers, commonly denoted , form a sequence, the Fibonacci sequence, in which each number is the sum of the two preceding ones. The sequence commonly starts from 0 and 1, although some authors start the sequence from ...

, number of partitions of 52 into prime parts ** one of two ISBN Group Identifiers for books published in Argentina * 988 = 2² × 13 × 19, nontotient. sum of four consecutive primes (239 + 241 + 251 + 257). A

cake number In mathematics, the cake number, denoted by ''Cn'', is the maximum of the number of regions into which a 3-dimensional cube can be partitioned by exactly ''n'' planes. The cake number is so-called because one may imagine each partition of the cu ...

. ** one of two ISBN Group Identifiers for books published in Hong Kong. * 989 = 23 × 43, Extra strong

Lucas pseudoprime Lucas pseudoprimes and Fibonacci pseudoprimes are composite integers that pass certain tests which all primes and very few composite numbers pass: in this case, criteria relative to some Lucas sequence. Baillie-Wagstaff-Lucas pseudoprimes Baill ...

** one of two ISBN Group Identifiers for books published in Portugal

990s

* 990 = 2 × 3² × 5 × 11, sum of six consecutive primes (151 + 157 + 163 + 167 + 173 + 179), triangular number, Harshad number ** best possible VantageScore credit score * 991 = prime number, sum of five consecutive primes (191 + 193 + 197 + 199 + 211), sum of seven consecutive primes (127 + 131 + 137 + 139 + 149 + 151 + 157), Chen prime, lucky prime, prime index prime * 992 = 2⁵ × 31,

, nontotient; number of eleven-dimensional

exotic sphere In an area of mathematics called differential topology, an exotic sphere is a differentiable manifold ''M'' that is homeomorphic but not diffeomorphic to the standard Euclidean ''n''-sphere. That is, ''M'' is a sphere from the point of view of a ...

s. ** country calling code for Tajikistan * 993 = 3 × 331 ** country calling code for Turkmenistan * 994 = 2 × 7 × 71, sphenic number, nontotient, number of binary words of length 13 with all distinct runs. ** country calling code for Azerbaijan * 995 = 5 × 199 ** country calling code for Georgia ** Singapore fire brigade and emergency ambulance services hotline * 996 = 2² × 3 × 83 ** country calling code for Kyrgyzstan * 997 = largest three-digit prime number, strictly non-palindromic number. It is also a

lucky prime In number theory, a lucky number is a natural number in a set which is generated by a certain "sieve". This sieve is similar to the Sieve of Eratosthenes that generates the primes, but it eliminates numbers based on their position in the remain ...

. * 998 = 2 × 499, nontotient, number of 7-node graphs with two connected components. ** country calling code for Uzbekistan * 999 = 3³ × 37,

Kaprekar number In mathematics, a natural number in a given number base is a p-Kaprekar number if the representation of its square in that base can be split into two parts, where the second part has p digits, that add up to the original number. The numbers are n ...

, Harshad number ** In some parts of the world, such as the UK and

Commonwealth A commonwealth is a traditional English term for a political community founded for the common good. Historically, it has been synonymous with "republic". The noun "commonwealth", meaning "public welfare, general good or advantage", dates from the ...

countries, 999 (pronounced as 9-9-9) is the

. ** 999 was a London

punk Punk or punks may refer to: Genres, subculture, and related aspects * Punk rock, a music genre originating in the 1970s associated with various subgenres * Punk subculture, a subculture associated with punk rock, or aspects of the subculture s ...

band active during the 1970s.

References

{{DEFAULTSORT:900 (Number) Integers