130 (number)

← 129 130 131 →
Cardinalone hundred thirty
Ordinal130th
(one hundred thirtieth)
Factorization2 × 5 × 13
Divisors1, 2, 5, 10, 13, 26, 65, 130
Greek numeralΡΛ´
Roman numeralCXXX, cxxx
Binary100000102
Ternary112113
Senary3346
Octal2028
DuodecimalAA12
Hexadecimal8216

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 adsurd number.[2]

In other fields

  • A 130-30 fund or a ratio up to 150/50 is a type of collective investment vehicle

References

  1. ^ MathWorld - Hexagonal Number
  2. ^ Mackenzie, Dana (March 2018). "2184: An Absurd (and Adsurd) Tale". Integers. 18.
This article is issued from Wikipedia. The text is available under Creative Commons Attribution-Share Alike 4.0 unless otherwise noted. Additional terms may apply for the media files.