primality
/praɪˈmælətɪ/the state of being primal (= relating to an early stage of development, or to the time when human life on earth began)
noun [抽象名词]原始；首要；根本；素性
Of course, much more efficient algorithms for testing primality exist, but this one is the easiest to understand.
当然还有效率更高的素数测试方法，不过这种算法最容易理解。
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