130 (number)
(Redirected from Number 130)
Template:Infobox number 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.[1]
130 equals both 27 + 2 and 53 + 5 and is therefore a doubly strictly Template:Not a typo number.[2]
In other fields
- A 130-30 fund or a ratio up to 150/50 is a type of collective investment vehicle
References
- ↑ MathWorld - Hexagonal Number
- ↑ Script error: No such module "Citation/CS1".