RU-ALLRUSSIAN 1986 Problem 20
Let S be the set of all numbers which can be written as 1/mn, where m and n are positive integers not exceeding 1986. Show that the sum of the elements of S is not an integer.
Dataset text NuminaMath olympiads. Quoted with source.
Solutions
No solution is on olymmath yet. Official and human solutions come first when they arrive. AI solutions come after them, with a label.