翻訳と辞書 Words near each other ・ Faculdade de Medicina de São José do Rio Preto ・ Faculdade de Telêmaco Borba ・ Faculdade de Teologia Metodista Livre ・ Factorial moment generating function ・ Factorial moment measure ・ Factorial number system ・ Factorial prime ・ Factories Act 1847 ・ Factories Act 1948 ・ Factories Act 1961 ・ Factories/Indians ・ Factoring ・ Factoring (finance) ・ Factoring Regulation Act, 2011 ・ Factorio ・ Factorion ・ Factorization ・ Factorization lemma ・ Factorization of polynomials ・ Factorization of polynomials over finite fields ・ Factorization of the mean ・ Factorization system ・ Factors affecting permeability of soils ・ Factors associated with being a victim of sexual violence ・ Factors of polymer weathering ・ Factors of production ・ Factors of the Seven ・ Factorum ac dictorum memorabilium libri IX ・ Factory ・ Factory (Band of Horses song) Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Factorion ： ウィキペディア英語版 Factorion A factorion is a natural number that equals the sum of the factorials of its decimal digits. For example, 145 is a factorion because 1! + 4! + 5! = 1 + 24 + 120 = 145. There are just four factorions (in base 10) and they are 1, 2, 145 and 40585 . "Factorion" is a name coined by book author Clifford A. Pickover in Chapter 22 of his book ''Keys to Infinity'' in a chapter titled "The Loneliness of the Factorions". ==Upper bound== If ''n'' is a natural number of ''d'' digits that is a factorion, then 10''d'' − 1 ≤ ''n'' ≤ 9!''d''. This fails to hold for ''d'' ≥ 8 thus ''n'' has at most 7 digits, and the first upper bound is 9,999,999. But the maximum sum of factorials of digits for a 7 digit number is 9! *7 = 2,540,160 establishing the second upper bound. Going further, 9!6 is 2,177,280, and the only 7 digit number not larger than 2,540,160 containing six 9's is 1,999,999, which is not a factorion by inspection. The next highest sum would be given by 1,999,998, yielding a third upper bound of 1,854,721. 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「Factorion」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.