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标题: Mersenne prime [打印本页]

作者: yma16 时间: 2008-1-27 03:53
标题: Mersenne prime

A Mersenne prime is a prime number of the form 2^n-1; for instance, 7 = 2^3-1.

Prove that if 2^n-1 is a prime then 2^n+1 is not a prime, and if 2^n+1 then 2^n-1 is not a prime for n>2.

Is there a name for the primes of the form 2^n+1?

作者: 东北逍遥客 时间: 2008-1-30 09:39
标题: 回复：Mersenne prime

as questions answered before, it' can be divided by 3.

作者: yma16 时间: 2008-2-1 02:00
标题: 回复：回复：Mersenne prime

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