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如果A是一個自然數,並且 1)A>1 2)找不到兩個大於1的自然數B、C使得A=B*C(B、C相等也可以) 那麼A就是素數. 例如1不滿足1),所以1不是素數. 又如4=2*2,不滿足2),所以4不是素數. 20以內的素數有 2,3,5,7,11,13,17,19
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