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125 (number) : ウィキペディア英語版 | 125 (number)
125 (ones hundred () twenty-five) is the natural number following 124 and preceding 126. ==In mathematics==
125 is the cube of 5. It can be expressed as a sum of two squares in two different ways, 125 = 10² + 5² = 11² + 2².〔Wells, D. ''The Penguin Dictionary of Curious and Interesting Numbers'' London: Penguin Group. (1987): 136〕 125 and 126 form a Ruth-Aaron pair under the second definition in which repeated prime factors are counted as often as they occur. Like many other powers of 5, it is a Friedman number in base 10 since 125 = 51 + 2.
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