Art of Problem Solving
AoPS Online
Math texts, online classes, and more
for students in grades 5-12.
Visit AoPS Online ‚
Books for Grades 5-12 Online Courses
Beast Academy
Engaging math books and online learning
for students ages 6-13.
Visit Beast Academy ‚
Books for Ages 6-13 Beast Academy Online
AoPS Academy
Small live classes for advanced math
and language arts learners in grades 2-12.
Visit AoPS Academy ‚
Find a Physical Campus Visit the Virtual Campus

2005 IMO Problems/Problem 4

Revision as of 14:42, 28 August 2022 by Arcticturn (talk | contribs)

Determine all positive integers relatively prime to all the terms of the infinite sequence \[a_n=2^n+3^n+6^n -1,\ n\geq 1.\]

Solution

The Answer is 1.

Retrieved from "https://artofproblemsolving.com/wiki/index.php?title=2005_IMO_Problems/Problem_4&oldid=177621"