MathDB
Putnam 2010 A4

Source:

December 6, 2010
Putnammodular arithmeticnumber theorygreatest common divisorlogarithmscollege contestsPutnam number theory

Problem Statement

Prove that for each positive integer n,n, the number 101010n+1010n+10nāˆ’110^{10^{10^n}}+10^{10^n}+10^n-1 is not prime.
Back to ProblemsView on AoPS