On A Divisor Sum Involving Pairwise Relatively Prime Positive Integers

The number of tuples with positive integers pairwise relatively prime to each other with product at most $n$ is considered. A generalization of ${\mu }^2$ where $\mu$ is the M"{o}bius function is used to formulate this divisor sum and establish some identities. One such identity is a weighted sum of reciprocal of square-free numbers not exceeding $n$. Some auxiliary number theoretic functions are introduced to formulate this sum.