VMO 2022 problem 4 day 1
Source: Vietnam Mathematical Olympiad 2022 problem 4 day 1
March 4, 2022
vmonumber theoryDivisibility
Problem Statement
For every pair of positive integers with , denote be the number of positive integers such that the number is in the range and the number is coprime with . Find all positive integers such that satisfy these condition:
i) for all ;
ii) is divisible by