2+3+7+9+12+15+17+21+22+27+27+33+32+39+37+45
2+3+7+9+12+15+17+21+22+27+27+33+32+39+37+45
那1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 4
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43
1-3+5-7+9-11+13-15+17-19+21-23+25-27+29-31+33-35+37-39+41=?
1+3+5+7+9+11+13+15+17+19+21+23+25+27+29+31+33+35+37+39+41+43
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 37 39 41 …… 其中
1,9,11,15,17,19,21,27,33,35,37,41,45,49,57,65,72,81质数有
1,9,11,15,17,19,21,27,33,35,37,41,45,49,57,65,72,81合数有,偶数有,3
1+3+5+7+9+11+13+15+17+19+21+25+27+29+31+35+37+39+41+43+47+49
11+13+15+17+19+21+23+25+27+29+31+33+35+37+39+41+43+45,计算时有什么
11+13+15+17+19+21+23+25+27+29+31+33+35+37+39+41+43+45,计算时规律?
20*21*22*23*24*25*26*27*28*29*30*31*32*33*34*35*36*37*38*39*