什么是素数？数学家为什么对它们感兴趣？
素数是这样的整数，它除了能表示为它自己和１的乘积
以外，不能表示为任何其它两个整数的乘积。例如，１５＝
３×５，所以１５不是素数；又如，１２＝６×２＝４×３，
所以１２也不是素数。另一方面，１３除了等于１３×１以
外，不能表示为其它任何两个整数的乘积，所以１３是一个
素数。
有的数，如果单凭印象去捉摸，是无法确定它到底是不
是素数
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