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217 (number) : ウィキペディア英語版 | 217 (number)
217 is the natural number following 216 and preceding 218. 217 is a centered hexagonal number, a 12-gonal number, a centered 36-gonal number, a Fermat pseudoprime to base 5, and a Blum integer.〔(The Number 217 ), Virtue Science〕 It is both the sum of two positive cubes and the difference of two positive consecutive cubes in exactly one way: . When written in binary, it is a non-repetitive Kaprekar number.〔(The non-repetitive Kaprekar binary numbers in decimal ), OEIS〕 ==See also==
*217, the year
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