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可考慮該數的末位 2^n末位隨著n的遞增 每四比特一迴圈 即若n=4m時末位為6 若n=4m+1時末位為2 若n=4m+2時末位為4 若n=4m+3時末位為8 由於76=4*19 所以2^76尾數為6 2^76-1尾數為5 所以5|2^76-1 2^76-1為合數
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