A note on a conjecture of Erdős and Rosenfeld (Q1306702)

For a positive integer \(n\), put \(D(n)=\{| a-b| : ab=n\}\). The author shows that for every positive integer \(k\), there is a set of positive integers \(K\) such that \(| K| =k\) and \(| \bigcap _{n\in A} D(n)| \geq 3\).