On a sum of a multiplicative function linked to the divisor function over the set of integers B-multiple of 5

Mihoub Bouderbala

Let $d(n)$ and $d^{\ast }(n)$ be the numbers of divisors and the numbers of unitary divisors of the integer $n\ge 1$. In this paper, we prove that \[ \underset{n\in\mathcal{B}}{\und…