摘要：
[HAOI2007]反素数 题目描述 对于任何正整数x，其约数的个数记作$g\left ( x \right )$。例如$g\left ( 1 \right )=1,g\left ( 6 \right )=4$。 如果某个正整数x满足：$0 \lt i \lt x$，都有$g\left ( x \r 阅读全文
摘要：
Poj2689 Prime Distance Description The branch of mathematics called number theory is about properties of numbers. One of the areas that has captured t 阅读全文