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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク 50 (number) ： ウィキペディア英語版 50 (number) 50 (fifty) is the natural number following 49 and preceding 51. ==In mathematics== Fifty is the smallest number that is the sum of two non-zero square numbers in two distinct ways: 50 = 12 + 72 = 52 + 52.〔de Koninck, J.M. (2009). ''Those fascinating numbers''. AMS Bookstore. p. 18. ISBN 0-8218-4807-0.〕 It is also the sum of three squares, 50 = 32 + 42 + 52. It is a Harshad number. There is no solution to the equation φ(x) = 50, making 50 a nontotient. Nor is there a solution to the equation x − φ(x) = 50, making 50 a noncototient. The aliquot sum of 50 is 43 and its aliquot sequence is (50,43,1,0). Fifty is itself the aliquot sum of 40 and 94. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「50 (number)」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.