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證明:如果n不能被2到根號n之間的任一整數整除,且不是質數 那麼n可以表示為:n=ab 其中ab是非1正整數 因為n不能被2到根號n之間的任一整數整除 所以a>根號n b>根號n ab>根號n×根號n=n 這跟ab=n是衝突的,所以原來的命題得證.
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