Corrigendum: A conjecture of De Koninck regarding particular values of the sum of divisors function

Abstract

The proof of Lemma 7 of [1]is made complete by giving the proof of a missing Case (4). This omission was pointed out to the authors by Min Tang, to whom we are most grateful. The same definitions and notation are employed as in [1], and one should replace the first paragraph of the proof by the following argument.