Any prime>3 can be written as 2n-1 or 2n+1 where n is an integer. Can it also written as mn-1 or mn+1, where m=3,4,5,6? (prove is needed for each m). If the answer is true, what is the smallest even m such that the question is not true and what is the smallest odd m such that the question is not true? Thanks.
哈哈哈哈 O(∩_∩)O哈哈~ 好久不来了，不小心看了一眼自己主页，发现自动关联了自己以往发过的帖，点进这个看了一眼，笑个半死。。。敢情我当初还发过这么搞笑的东西啊，我自己完全不记得了 
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发表于 2010-4-4 01:42:13
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