除了自身之外，无法被其它整数整除的数称之为质数，要求质数很简单，但如何快速的 求出质数则一直是程式设计人员与数学家努力的课题，在这边介绍一个着名的Eratosthenes求质 数方法。-In addition to outside itself, can not be called an integer divisible by the number of other primes, prime requirement is very simple, but how fast Fi