23乘以一个自然数。3b8F*B/E1j3Q5P7L0R8d
1、要使积是质数，应该乘以5W8r7d5{.K.\(l(V'q-?8m,r3`；3b8F*B/E1j3Q5P7L0R8d
2、要使积是合数，应该乘以3k8L/w；3b8F*B/E1j3Q5P7L0R8d
3、要使积是奇数，应该乘以/~+m(t6H'~；3b8F*B/E1j3Q5P7L0R8d
4、要使积是偶数，应该乘以1m6}3M'u,x;d.H；3b8F*B/E1j3Q5P7L0R8d
要使积是能被3整除的数，应该乘以9F(`4J。3b8F*B/E1j3Q5P7L0R8d