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83 (number) : ウィキペディア英語版
83 (number)

83 (eighty-three) is the natural number following 82 and preceding 84.
==In mathematics==
83 is the sum of three consecutive primes (23 + 29 + 31) as well as the sum of five consecutive primes (11 + 13 + 17 + 19 + 23).
83 is the 23rd prime number, following 79 (of which it is also a cousin prime) and preceding 89. 83 is a Sophie Germain prime and a safe prime, and also a Chen prime. It is an Eisenstein prime with no imaginary part and real part of the form 3n - 1.
83 is a highly cototient number.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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