Positive integers $n$ so that $n^2$ divides $2^n+1$.

Asked Aug 09 '13 at 21:34

Active Aug 09 '13 at 21:35

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Find all positive integers $n$ for which $n^2$ divides $2^n+1$.

edited Aug 09 '13 at 21:35

Alex Wertheim

asked Aug 09 '13 at 21:34

7

The solution can be found here http://www.artofproblemsolving.com/Resources/Papers/SatoNT.pdf on page 33. But id try to prove it before you look at the solution. – user60887 Aug 09 '13 at 21:58

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