倍数含量的重叠比例:大家知道在(1,2,3,4,5,6,7..............n )或(2n-1,2n-2,2n-3,2n-4.2n-5..........n )中,若筛去任何一个素数篇p的倍数同时也筛去了部分q 的倍数,如筛去(1,2,3,4,5,6,7..............100 )中3的倍数,同时筛去了2的倍数6,12,18,24,30,36,42,48,54,60,66,742,78,84,88,92,98,
5的倍数15,30,45,60,75,90,
7的倍数21,42,63,84. |