If the difference is one, then one of the two is

来源: 屋漏痕 于 2010-04-01 11:47:04 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (147 bytes)
本帖于 2010-04-08 18:02:03 时间, 由版主 于德利 编辑
回答: 看看这样行不行 由 mitts 于 2010-03-31 15:49:09

an even number. If it's 2, then the other one is 1 or 3. If it's not 2, then it can be divided by 2. Therefore, not a prime. So it must be 2.

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