翻訳と辞書 |
888 (number) : ウィキペディア英語版 | 888 (number)
888 is a natural number with both mathematical and symbolic meaning. ==In mathematics== 888 is a repdigit (a number all of whose digits are equal), and a strobogrammatic number (one that reads the same upside-down on a seven-segment calculator display). 8883 = 700227072 is the smallest cube in which each digit occurs exactly three times, and the only cube in which three distinct digits each occur three times.〔.〕 888 the smallest multiple of 24 whose digit sum is 24, and as well as being divisible by its digit sum it is divisible by all of its digits. 888 is a practical number, meaning that every positive integer up to 888 itself may be represented as a sum of distinct divisors of 888.〔(Nombres pratiques ) (in French), Jeux et Mathématiques, Jean-Paul Davalan, retrieved 2013-01-31.〕 There are exactly 888 trees with four unlabeled and three labeled nodes, exactly 888 seven-node undirected graphs without isolated vertices, and exactly 888 non-alternating knots whose crossing number is 12.
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「888 (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.
|
|