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2005 IMO Shortlist Problems/N1

Revision as of 03:52, 16 August 2011 by Mathmdmb (talk | contribs) (Created page with "Consider the sequence <math>a_1,a_2, . . .</math> defined by <math>a_n=2^n+6^n+3^n-1</math> for <math>n = 1,2, . . . </math>. Determine all positive integers that are relatively...")
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Consider the sequence $a_1,a_2, . . .$ defined by $a_n=2^n+6^n+3^n-1$ for $n = 1,2, . . .$.

Determine all positive integers that are relatively prime to every term of the sequence.

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