个位是1,3,7,9的数1.3.7.9.11.13.17.19.21.23.27.29.31.33.37.39.41.43.47.49.51.53.57.59.61.63.67.69.71.73.77.79.81.83.87.89.91.93.97.9940个 不要相信上面那人,比如9,不是质数,但9/100是最简分数...