Problem

Source: 44th International Tournament of Towns, Senior A-Level P5, Fall 2022 & Kvant Magazine No. 11-12 2022 M2724

Tags: number theory, Tournament of Towns, sum of digits, Kvant



In an infinite arithmetic progression of positive integers there are two integers with the same sum of digits. Will there necessarily be one more integer in the progression with the same sum of digits? Proposed by A. Shapovalov