MathDB
2003 BAMO p4 (for every d>0 with d/n => d+1/n+1 ) => n is prime

Source:

August 26, 2019
number theorydivisorprime

Problem Statement

An integer n>1n > 1 has the following property: for every (positive) divisor dd of n,d+1n, d + 1 is a divisor of n+1n + 1. Prove that nn is prime.
Back to ProblemsView on AoPS