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58 (number) : ウィキペディア英語版
58 (number)

58 (fifty-eight) is the natural number following 57 and preceding 59.
==In mathematics==

Fifty-eight has an aliquot sum of 32 and is the second composite member of the 31-aliquot tree.
Fifty-eight is the sum of the first seven prime numbers, an 11-gonal number, and a Smith number.
Given 58, the Mertens function returns 0.
There is no solution to the equation ''x'' - φ(''x'') = 58, making 58 a noncototient. However, the sum of the totient function for the first thirteen integers is 58.

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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