2005 IMO Problems/Problem 4
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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)
