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Seminar Announcement — Mathematics Research Center
General Seminar
On a conjecture of Erdos, Granville, Pomerance, and Spiro
Lola Thompson
Utrecht University, The Netherlands
Date November 13, 2025
Time 14:00
Location MRC @ UFAZ 101
Abstract

Let \(s(n)\) denote the sum of proper divisors of an integer \(n\). The function \(s(n)\) has been studied for thousands of years, due to its connection with the perfect numbers. In 1992, Erdos, Granville, Pomerance, and Spiro (EGPS) conjectured that if \(\mathcal{A}\) is a set of integers with asymptotic density zero then \(s^{-1}(\mathcal{A})\) also has asymptotic density zero. This has been confirmed for certain specific sets \(\mathcal{A}\), but remains open in general. In this talk, we will give a survey of recent progress towards the EGPS conjecture. This talk is based on joint work with various subsets of the following co-authors: Kübra Benli, Giulia Cesana, Cécile Dartyge, Charlotte Dombrowsky, Paul Pollack, and Carl Pomerance.