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135 (number) : ウィキペディア英語版
135 (number)

135 (one hundred () thirty-five) is the natural number following 134 and preceding 136.
==In mathematics==
This number in base 10 can be expressed in operations using its own digits in at least two different ways. One is as a sum-product number,
135 = (1 + 3 + 5)(1 \times 3 \times 5)
(1 and 144 share this property) and the other is as the sum of consecutive powers of its digits:
135 = 1^1 + 3^2 + 5^3
(175, 518, and 598 also have this property).
135 is a Harshad number, and a repdigit in bases 18 and 26.
There are a total of 135 primes between 1,000 and 2,000.
135 = 11 n^2 + 11 n + 3 for n = 3. This polynomial plays an essential role in Apéry's proof that \zeta(2) is irrational.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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