用筛选法可得到2～10000之间的所有素数，找出此序列中最长的等差序列（连续的和不连续的两种）。例如：3，5，7 为一连续等差序列，长度为3，公差为2；而7，13，19 为一不连续等差序列，长度为3，公差为6。-2 with the screening method available for all prime numbers between 10000 to find out the sequence of the longest arithmetic sequence (continuous and discontinuous two). For example: 3,5,7 for a continuous arithmetic sequence of length 3 with a tolerance of 2　and 7,13,19 for a discrete arithmetic sequence of length 3, tolerance is 6.