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89 (number)
89 (eighty-nine) is the natural number following 88 and preceding 90. In mathematics 89 is: * the 24th prime number, following 83 and preceding 97. * a Chen prime. * a Pythagorean prime. * the smallest Sophie Germain prime to start a Cunningham chain of the first kind of six terms, . * an Eisenstein prime with no imaginary part and real part of the form . * The 11th Fibonacci number and thus a Fibonacci prime as well. The first few digits of its reciprocal coincide with the Fibonacci sequence due to the identity ::\frac=\sum_^\infty=0.011235955\dots\ . * a Markov number, appearing in solutions to the Markov Diophantine equation with other odd-indexed Fibonacci numbers. ''M''89 is the 10th Mersenne prime. Although 89 is not a Lychrel number in base 10, it is unusual that it takes 24 iterations of the reverse and add process to reach a palindrome. Among the known non-Lychrel numbers in the first 10000 integers, no other number requires that many or more iterations. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prime Number
A prime number (or a prime) is a natural number greater than 1 that is not a Product (mathematics), product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways of writing it as a product, or , involve 5 itself. However, 4 is composite because it is a product (2 × 2) in which both numbers are smaller than 4. Primes are central in number theory because of the fundamental theorem of arithmetic: every natural number greater than 1 is either a prime itself or can be factorization, factorized as a product of primes that is unique up to their order. The property of being prime is called primality. A simple but slow primality test, method of checking the primality of a given number , called trial division, tests whether is a multiple of any integer between 2 and . Faster algorithms include the Miller–Rabin primality test, which is fast but has a small chance of error ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lychrel Number
A Lychrel number is a natural number that cannot form a palindrome through the iterative process of repeatedly reversing its digits and adding the resulting numbers. This process is sometimes called the ''196-algorithm'', after the most famous number associated with the process. In base ten, no Lychrel numbers have been yet proven to exist, but many, including 196, are suspected on heuristic and statistical grounds. The name "Lychrel" was coined by Wade Van Landingham as a rough anagram of "Cheryl", his girlfriend's first name. Reverse-and-add process The reverse-and-add process produces the sum of a number and the number formed by reversing the order of its digits. For example, 56 + 65 = 121. As another example, 125 + 521 = 646. Some numbers become palindromes quickly after repeated reversal and addition, and are therefore not Lychrel numbers. All one-digit and two-digit numbers eventually become palindromes after repeated reversal and addition. About 80% of all numbers unde ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Internet In China
China has been on the Internet intermittently since May 1989 and on a permanent basis since 20 April 1994, although with heavily Internet censorship in China, censored access. In 2008, China became the country with the largest population on the Internet and, , has remained so. 1.09 billion (77.5% of the country's total population) use internet in China. China's first foray into the global cyberspace was an email (not TCP/IP based and thus technically not internet) sent on 20 September 1987 to the Karlsruhe Institute of Technology, reading, "Across the Great Wall of China, Great Wall, towards the rest of the world" (). This later became a well-known phrase in China and , was displayed on the desktop login screen for Tencent QQ, QQ mail. History From 1995 to 2004, internet use in China was almost entirely in urban areas. By 2003, less than 0.2% of rural people had used the internet. In 2004, the Ministry of Industry and Information Technology began the Connecting Every Villag ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tiananmen Square Protests Of 1989
The Tiananmen Square protests, known within China as the June Fourth Incident, were student-led demonstrations held in Tiananmen Square in Beijing, China, lasting from 15 April to 4 June 1989. After weeks of unsuccessful attempts between the demonstrators and the Chinese government to find a peaceful resolution, the Chinese government deployed troops to occupy the square on the night of 3 June in what is referred to as the Tiananmen Square massacre. The events are sometimes called the '89 Democracy Movement, the Tiananmen Square Incident, or the Tiananmen uprising. The protests were precipitated by the death of pro-reform Chinese Communist Party (CCP) general secretary Hu Yaobang in April 1989 amid the backdrop of rapid economic development and social change in post-Mao China, reflecting anxieties among the people and political elite about the country's future. The reforms of the 1980s had led to a nascent market economy that benefited some people but seriously disadva ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Information Is Beautiful
David McCandless (born 1971) is a British data-journalist, writer and information designer. Career McCandless is the founder of the visual blog ''Information Is Beautiful''. Early explorations into the synergy between data visualisation and his work as a journalist led to the development of ''Information Is Beautiful'' and the subsequent publication of his book of the same name (titled ''A Visual Miscellaneum'' in the United States). McCandless began his career writing for cult video game magazines such as Your Sinclair and PC Zone in the late 1980s and 1990s before moving on to work for ''The Guardian'' and ''Wired'' magazine. Since the publication of ''Information Is Beautiful'' in 2009, his information design work has appeared in numerous publications, including The Guardian, Wired, and Die Zeit, and has also been showcased at the Museum of Modern Art in New York, the Wellcome Trust gallery in London, and at the Tate Britain. His second book, ''Knowledge Is Beautiful'', was p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diaethria Clymena Or Cramer's Eighty-eight
''Diaethria'' is a brush-footed butterfly genus found in the Neotropical realm, ranging from Mexico to Paraguay. Species in this genus are commonly called eighty-eights like the related genera ''Callicore'' and ''Perisama'', in reference to the characteristic patterns on the hindwing undersides of many. In ''Diaethria'', the pattern consists of black dots surrounded by concentric white and black lines, and typically looks like the numbers "88 (number), 88" or "89 (number), 89". Species Listed alphabetically: at Markku Savela's ''Lepidoptera and Some Other Life Forms'' * '''' (Guérin-Méneville, |
List Of Rugby Union Terms
Rugby union is a team sport played between two teams of fifteen (15) players. This is a general glossary of the terminology used in the sport of rugby union. Where words in a sentence are also defined elsewhere in this article, they appear in italics. __NOTOC__ 0-9 ;22 :The 22-metre line, marking from the tryline. ;89 :An "89" or ''eight-nine move'' is a phase following a ''scrum'', in which the ''number 8'' picks up the ball and transfers it to Scrum-half (rugby union), number 9 (''scrum-half''). ;99 call, 99 :The "99" call was a policy of simultaneous retaliation by the 1974 British Lions tour to South Africa, (the 99 comes from the British emergency services telephone number which is 999). The tour was marred by on-pitch violence, which the match officials did not adequately control and the relative absence of cameras compared to the modern game made citing and punishment after the fact unlikely. The Lions' captain, Willie John McBride (Ireland), therefore instigated ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oklahoma City
Oklahoma City (), officially the City of Oklahoma City, and often shortened to OKC, is the List of capitals in the United States, capital and List of municipalities in Oklahoma, most populous city of the U.S. state of Oklahoma. The county seat of Oklahoma County, Oklahoma, Oklahoma County, its population ranks List of United States cities by population, 20th among United States cities and 8th in the Southern United States. The population grew following the 2010 Census and reached 681,054 in the 2020 United States census. The Oklahoma City metropolitan area had a population of 1,396,445, and the Oklahoma City–Shawnee, Oklahoma, Shawnee Combined Statistical Area had a population of 1,469,124, making it Oklahoma's largest municipality and metropolitan area by population. Oklahoma City's city limits extend somewhat into Canadian County, Oklahoma, Canadian, Cleveland County, Oklahoma, Cleveland, and Pottawatomie County, Oklahoma, Pottawatomie counties. However, much of those areas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
White American
White Americans (sometimes also called Caucasian Americans) are Americans who identify as white people. In a more official sense, the United States Census Bureau, which collects demographic data on Americans, defines "white" as " person having origins in any of the original peoples of Europe, the Middle East, or North Africa". This group constitutes the majority of the people in the United States, although their proportion of the overall population has been gradually declining. As of the latest American Community Survey in 2023, the US Census Bureau estimates that 60.5% of the US population, or 202,651,650 people, are White alone, while Non-Hispanic Whites make up 57.1% of the population. Overall, 72.3% of Americans identify as White alone or in combination. European Americans are by far the largest panethnic group of white Americans and have constituted the majority population of the United States since the nation's founding. Middle Eastern Americans constitute a much small ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unassigned Lands
The Unassigned Lands in Oklahoma were in the center of the lands ceded to the United States by the Creek (Muskogee) and Seminole Indians following the Civil War and on which no other tribes had been settled. By 1883, it was bounded by the Cherokee Outlet on the north, several relocated Indian reservations on the east, the Chickasaw lands on the south, and the Cheyenne-Arapaho reserve on the west. The area amounted to . In 1889, this territory was offered by the federal government to non-Native Americans for settlement in the Oklahoma Land Rush. Indian era The Treaty of Indian Springs, February 12, 1825, provided for a delegation of Creeks to visit the west in order that they may select any other territory, west of the Mississippi, on Red, Canadian, Arkansas, or Missouri Rivers to replace their lands in Georgia. A dispute arose between the Lower Creek Council, which signed the treaty, and the Upper Creek Council, which objected. The dispute led to the killing of General ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Land Run Of 1889
The Oklahoma Land Rush of 1889 was the first land run into the Unassigned Lands of the former western portion of the federal Indian Territory, which had decades earlier since the 1830s been assigned to the Creek and Seminole native peoples. The area that was opened to settlement included all or part of the Canadian, Cleveland, Kingfisher, Logan, Oklahoma, and Payne counties of the present-day U.S. state of Oklahoma. The land run started at high noon (12:00 pm) on April 22, 1889. An estimated 50,000 people were lined up at the start, seeking to gain a piece of the available . The Unassigned Lands were considered some of the best unoccupied public land in the United States. The Indian Appropriations Act of 1889 was passed and signed into law with an amendment by U.S. Representative (congressman) William McKendree Springer (1836-1903), ( Republican of Illinois) that authorized 23rd President Benjamin Harrison (1833-1901, served 1889-1893), to open the two million acres (8,100& ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Minor League Baseball
Minor League Baseball (MiLB) is a professional baseball organization below Major League Baseball (MLB), constituted of teams affiliated with MLB clubs. It was founded on September 5, 1901, in response to the growing dominance of the National League (baseball), National League and American League, as the National Association of Professional Baseball Leagues (NAPBL or NA). Minor League Baseball originated as simply the organization of lower tiers of professional baseball in the United States, comprising clubs that lacked the financial means to compete with the National League and later the American League. The association of minor leagues remained independent throughout the early 20th century, protected by agreements with the major leagues to ensure they were compensated when minor-league players were signed by major-league clubs. Later, Minor League Baseball evolved to be constituted entirely of farm team, affiliates of larger clubs, giving young prospects a chance to develop the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
