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約數的個數等於質因數次數加1的積. 8=(1+1)(1+1)(1+1)=(1+1)(3+1)=(7+1) 囙此N的形式為p*q*r,或p*q^3,或p^7 對應上述形式的最小數位分別為: 2*3*5 = 30 2^3 * 3 = 24 2^7 = 128 囙此最小的一個數為24
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