how many natural solutions are there to the following equation: $ \sum_{i=0}^k x_i^2 = n$ where $n,k \in\ \Bbb{N}$
i well like to get a answer for every n and k, but could do with just $k=2,3$.
how many natural numbers on a sphere
3
$\begingroup$
diophantine-equations
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0See http://mathworld.wolfram.com/SumofSquaresFunction.html – 2012-09-21