2005 IMO Problems/Problem 4
Determine all positive integers relatively prime to all the terms of the infinite sequence ![\[a_n=2^n+3^n+6^n -1,\ n\geq 1.\]](http://latex.artofproblemsolving.com/a/3/f/a3f3c15ee9d92c2eb2747f800d908cfa7aa6a08b.png)
Solution
The Answer is 1.
Sign In
0
math training & tools
Alcumus
Videos
For the Win!
MATHCOUNTS Trainer
LaTeX TeXeR
MIT PRIMES/CrowdMath
Keep Learning
