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設p(p+1)+22=a2,所以p(p+1)=2a2-2=2(a+1)(a-1),因為p為質數,所以①p=a-1或者②p=a+1或者③p=2,①當p=a-1時,設a-1=kp,(k為≥1的正整數)所以a=kp+1,所以p(p+1)=2kp(kp+2),所以p+1=2k(kp+2),所…
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