[代數] 一題數論

[bajifox (嘖)]

let a and n>1 be any integers such that a^(n-1)≡1(mod n)

but a^d not≡ 1 for every proper divisor d of n-1
        ^^^^^
     表示不同餘 XD

prove that n is a prime


哈哈不太知道怎麽做
謝謝

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