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Jun
5
awarded  Student
Jun
5
comment Number of integer solutions: $x^2 + y^2 + z^2 = N$
Thank, but for $N = 10^9$ O(N) is very slow.
Jun
5
comment Number of integer solutions: $x^2 + y^2 + z^2 = N$
Thank you for your answer, I will to try read this book)
Jun
5
comment Number of integer solutions: $x^2 + y^2 + z^2 = N$
Thank, but I don't know character theory. Is it really need for solving this problem ?
Jun
5
asked Number of integer solutions: $x^2 + y^2 + z^2 = N$