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let p=7, according to you, the minimum s=p-1=6, or 2^6 ≡ 1(mod 7). But 2^3 ≡ 1(mod 7), isn't it?

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• 对不起，讲错了。 -fwjy- ♂ (81 bytes) () 07/01/2007 postreply 13:33:24