1到50的质数2,3,5,7,11,13,17,19,23,29 ,31,37,41,43,471到50的合数4,6,8,9,10,12,14,15,16,18,20,21,22,24,25,26,27,28,30 ,32,33,34,35,36,38,39,40,42,44,45,46,48,49