有2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43 , 47 , 53 , 59 , 61 , 67 和 69。