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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).
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