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不是一個質數,可被3除 2^71=(2^7)*(2^64) 2^7 mod 10=8 2^64 mod 10=6 =>2^71 mod 10= 8 =>(2^71 +1)mod 10 =9 => 10^0比特=9,可被3整除 已matlab驗證過,
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