翻訳と辞書
Words near each other
・ 254 Augusta
・ 254 BC
・ 254 Medical Regiment
・ 254 Squadron (Israel)
・ 254-260 Canal Street
・ 2541
・ 2542 Calpurnia
・ 2543 Machado
・ 2545 Verbiest
・ 25491 Meador
・ 254th Battalion (Quinte's Own), CEF
・ 254th Combat Communications Group
・ 254th Indian Tank Brigade
・ 254th Tunnelling Company
・ 255
255 (number)
・ 255 BC
・ 255 Oppavia
・ 255 series
・ 25511 Annlipinsky
・ 25518 Paulcitrin
・ 25519 Bartolomeo
・ 25520 Deronchang
・ 25593 Camillejordan
・ 255n
・ 255P/Levy
・ 255th Battalion (Queen's Own Rifles of Canada), CEF
・ 255th Indian Tank Brigade
・ 255th Tunnelling Company
・ 256


Dictionary Lists
翻訳と辞書 辞書検索 [ 開発暫定版 ]
スポンサード リンク

255 (number) : ウィキペディア英語版
255 (number)

255 (two hundred () fifty-five, CCLV) is the natural number following 254 and preceding 256.
==In mathematics==
Its factorization makes it a sphenic number.〔(【引用サイトリンク】url=https://oeis.org/A007304 )〕 Since 255 = 28 – 1, it is a Mersenne number〔(【引用サイトリンク】url=http://www.ams.org/journals/mcom/1964-18-085/S0025-5718-1964-0159775-8/S0025-5718-1964-0159775-8.pdf )〕 (though not a pernicious one), and the fourth such number not to be a prime number. It is a perfect totient number, the smallest such number to be neither a power of three nor thrice a prime.
Since 255 is the product of the first three Fermat primes, the regular 255-gon is constructible.
In base 10, it is a self number.
255 is a repdigit in base 2 (11111111) in base 4 (3333), and in base 16 (FF).

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「255 (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.