IMO 2016 Shortlist C2
Find all positive integers n for which all positive divisors of n can be put into the cells of a rectangular table under...
Category: Combinatorics
Problem
Find all positive integers n for which all positive divisors of n can be put into the cells of a rectangular table under the following constraints: • each cell contains a distinct divisor; • the sums of all rows are equal; and • the sums of all columns are equal.