115 (one hundred
ndfifteen) is the
natural number
In mathematics, the natural numbers are the numbers 0, 1, 2, 3, and so on, possibly excluding 0. Some start counting with 0, defining the natural numbers as the non-negative integers , while others start with 1, defining them as the positive in ...
following
114 and preceding
116.
In mathematics
115 has a
square
In geometry, a square is a regular polygon, regular quadrilateral. It has four straight sides of equal length and four equal angles. Squares are special cases of rectangles, which have four equal angles, and of rhombuses, which have four equal si ...
sum of divisors:
:
There are 115 different
rooted trees with exactly eight nodes, 115 inequivalent ways of placing six
rooks on a 6 × 6
chess board in such a way that no two of the rooks attack each other, and 115 solutions to the
stamp folding problem for a strip of seven stamps.
115 is also a
heptagonal pyramidal number. The 115th
Woodall number,
:
is a
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 ...
.
115 is the sum of the first five
heptagonal numbers.
See also
*
115 (disambiguation)
References
Integers
{{Num-stub