115 (number)

October 2023 115 1, 5, 23, 115 115 (one hundred [and] fifteen) is the natural number following 114 and preceding 116. In mathematics 115 has a square sum of divisors:A006532 Numbers n such that sum of divisors of n is a square There are 115 different rooted trees with exactly eight nodes,A000081 Number of rooted trees with n nodes (or connected functions with a fixed point) 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,A000903 Number of inequivalent ways of placing n nonattacking rooks on n X n board and 115 solutions to the stamp folding problem for a strip of seven rectangular stamps.A002369 Number of ways of folding a strip of n rectangular stamps 115 is also a heptagonal pyramidal number.A002413 Heptagonal (or 7-gonal) pyramidal numbers: n*(n+1)*(5*n-2)/6 The 115th Woodall number, is a prime number.A002234 Numbers n such that the Woodall number n*2^n - 1 is prime 115 is the sum of the first five heptagonal numbers. See also 115 (disambiguation) References 1 Category:Integers