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德國數學家科樂的演算,一個是193707721×761838257287,另一個是2的67次方-1,兩個算式的結果完全相同,既然它等於兩個數的乘積,可以分解成兩個因數,囙此證明了2的67次方-1不是質數,而是合數. 記住一個公式2^(5N)-1是質數
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