What is the sum of all positive integers $n$ for which $2^n + 65$ is a perfect square?
Perfect square. Factorising problem
2
$\begingroup$
elementary-number-theory
modular-arithmetic
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0Sum of all values of n that satisfy that condition – 2011-03-13
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0Thanks, I realized what you meant and deleted my comment. – 2011-03-13
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0Aargh, just realized tom hasn't been here in about 10 months. I have to remember to check these things *before* I post.... – 2012-01-22