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不妨將n分成六類,n=6k,n=6k+1,…,n=6k+5,然後討論.當n=6k時,n+3=6k+3=3(2k+1)與n+3為質數衝突;當n=6k+1時,n+3=6k+4=2(3k+2)與n+3為質數衝突;當n=6k+2時,n+7=6k+9=3(2k+3)與n+7為質數衝突;當n=6k+3…
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