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Integer coordinate set of points that is a member of sphere surface

Assume $C$ is a sphere with radius $r$ and center in the origin (0,0,0). How can we find the set of all points with integer coordinates that lie on the surface of $C$?

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    "I would also kindly request you stop accusing me of posting PE problems on every question I post." Khaled, you have posted 12 questions. On 10 of them I have made no mention whatever of Project Euler. Please refrain from telling lies about my activity here.2012-09-03

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