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

140 (one hundred () forty) is the natural number following 139 and preceding 141.
==In mathematics==

140 is an abundant number and a harmonic divisor number. It is the sum of the squares of the first seven integers, which makes it a square pyramidal number, and in base 10 it is divisible by the sum of its digits, which makes it a Harshad number.
140 is an odious number because it has an odd number of ones in its binary number. The sum of Euler's totient function φ(''x'') over the first twenty-one integers is 140.
140 is a repdigit in bases 13, 19, 27, 34, 69, and 139.

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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