How to find the number $P$ of integers $(n,m)$ such that $\operatorname{lcm}(n,m) = k$? Only $k$ is given.
I only find the number of $n$ such that $\operatorname{lcm}(n,k) = k$.
Can anyone help me solve this problem?
Thanks.
How to find the number $P$ of integers $(n,m)$ such that $\operatorname{lcm}(n,m) = k$? Only $k$ is given.
I only find the number of $n$ such that $\operatorname{lcm}(n,k) = k$.
Can anyone help me solve this problem?
Thanks.