BMO 2014 SL N1
Source: Balkan MO 2014 Shortlist
October 1, 2016
number theoryBalkan Mathematics OlympiadBalkan MO ShortlistParity
Problem Statement
Let be a positive integer, be the number of positive divisors of of the form and be the number of positive divisors of of the form where is a nonnegative integer.Find all positive integers such that and have different parity.