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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 47 (number) ： ウィキペディア英語版 47 (number) 47 (forty-seven) is the natural number following 46 and preceding 48. ==In mathematics== Forty-seven is the fifteenth prime number, a safe prime, the thirteenth supersingular prime, and the sixth Lucas prime. Forty-seven is a highly cototient number. It is an Eisenstein prime with no imaginary part and real part of the form $3n\; -\; 1$. It is a Lucas number because its digits appear as successive terms earlier in the series of Lucas numbers: 2, 1, 3, 4, 7, 11, 18, 29, 47… ; it is also a Keith number. Forty-seven is a strictly non-palindromic number. Its representation in binary being 00101111, 47 is a prime Thabit number, and as such is related to the pair of amicable numbers . Forty-seven is a Carol number. 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「47 (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.