Sums of averages of gcd-sum functions II

Lisa Kaltenböck, Isao Kiuchi, Sumaia Saad Eddin +1

Let $\gcd (k,j)$ denote the greatest common divisor of the integers $k$ and $j$, and let $r$ be any fixed positive integer. Define $$ M_r(x; f) := \sum_{k\leq x}\frac{1}{k^{r+1}}\su…