1,2,3,5,6,7,10,14,15,21,30,35,42,70,105和210有几个质数

问题描述:

1,2,3,5,6,7,10,14,15,21,30,35,42,70,105和210有几个质数

4个,分别是2,3,5,7

5个

4个质数,2,3,5,7.

2,3,5,7,
就这4个