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

來源: 屋漏痕 於 2010-04-01 11:47:04 [] [博客] [舊帖] [給我悄悄話] 閱讀數 : (147 bytes)
本帖於 2010-04-08 18:02:03 時間, 由版主 於德利 編輯
回答: 看看這樣行不行 由 mitts 於 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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