130 (number)

130 1, 2, 5, 10, 13, 26, 65, 130 130 (one hundred [and] thirty) is the natural number following 129 and preceding 131. In mathematics 130 is a sphenic number. It is a noncototient since there is no answer to the equation x - φ(x) = 130. 130 is the only integer that is the sum of the squares of its first four divisors, including 1: 12 + 22 + 52 + 102 = 130. 130 is the largest number that cannot be written as the sum of four hexagonal numbers.MathWorld - Hexagonal Number 130 equals both 27 + 2 and 53 + 5 and is therefore a doubly strictly adsurd number. Mackenzie Dana 2184: An Absurd (and Adsurd) Tale http://math.colgate.edu/~integers/s33/s33.Abstract.html Integers 18 March 2018 There is no value n between 130 and 4 × 130 = 520, such that 2n − 1, the nth Mersenne number, is prime. As of February 2026, 130 is the largest known integer with this property. In other fields A 130-30 fund or a ratio up to 150/50 is a type of collective investment vehicle References 1 Category:Integers