Does the integer k have at least three different positive prime factors?
题目
Does the integer k have at least three different positive prime factors?
(1)k/15 is an integer
(2)k/10 is an integer
答案写(1)中15的positive prime factors 是3 跟5 我想问下为什么没有1呢?1不属于prime factor吗?
答案
1 既不是质数也不是合数,很特殊的一个数~
举一反三
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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