Sums of proper divisors with missing digits

Kübra Benli, Giulia Cesana, Cécile Dartyge +2

Let $s(n)$ denote the sum of proper divisors of an integer $n$. In 1992, Erdős, Granville, Pomerance, and Spiro (EGPS) conjectured that if $\mathcal{A}$ is a set of integers with a…