英语翻译
问题描述:
英语翻译
How many distinct composite numbers can be formed by adding 2 of the first 5 prime numbers?
答
把前五个素数两两加起来能组成多少个合数?
前五个素数是:2,3,5,7,11
两两相加分别为:5,7,9,13,8,10,14,12,16,18
其中合数有9,8,10,14,12,16,18七个