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1和2是不是素数

更新时间: 2020-07-07 00:00:00     

1不是,2是。欧几里得的《几何原本》里对素数是这样定义的——能分成相等的两个部分的数就是素数。

至于0,是一个特殊的数,在中学之前的阶段基本上把它理解为不是素数。

关键词: 素数

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