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因為N=根號N*根號N 如果N含有一個大於根號N,小於N的約數a,則N必含有一個大於1,小於根號N的約數b 使得N=a*b 所以如果一個數N從2到根號N之間沒有約數,則必然在根號N到N-1之間也沒有約數,即N是一個素數
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