by 5

送交者: 零加一中 2020月07月04日18:26:04 于 [灵机一动] 发送悄悄话

回  答: 趣味的数学-383 由 gugeren 于 2020-07-02 22:53:01

2^4k/5 remain 1 2^(4k+1)/5 remain 2 2^(4k+2)/5 remain 4 2^(4k+3)/5 remain 3 2^2000/5 remain 1

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