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除了2.其他的素數都是奇數.要是3個素數都是奇數,相加的和即為奇數,既然和為偶數,則三個素數中必有一個2.所以設一個數為X,另一個為78-X,Y為另兩未知素數的積.則Y=X*(78-X)=78X-X*X=-(X* X-78X)=-(X-39)的平方+39…
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