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Is there a nice expression for the number of points in $\mathbb{Z}^3$ which lie a distance of $\sqrt{n}$ from the origin? Here, $n$ is of course a positive integer. |
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Post Closed as "exact duplicate" by François G. Dorais♦, Qiaochu Yuan, Noah Snyder, Hailong Dao, Reid Barton
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Is there a nice expression for the number of points in $\mathbb{Z}^3$ which lie at precisely a distance of $\sqrt{n}$ from the origin? Here, $n$ is of course a positive integer. |
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