求素数，并且保存于文本文件，并且下次执行还可以接着上次的结果继续找下去 所以总有一天你会找到最大的素数……每天就像挂Q一样挂一下这个程序就行了-Seek primes, and stored in a text file, and the next performance can also be followed by the last results continue to look down so that one day you will find the largest prime