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arXiv · 2609.14224

A Central Limit Theorem for Coprime Pair Counts in Randomly Translated Disks

Xin Hang Ji
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Abstract

We study the distribution of the number of coprime lattice points in randomly translated disks. We prove that its spatial variance is asymptotic to $σ^2r\log r$ and establish a central limit theorem under the corresponding normalization, where $σ^2$ is an explicit positive constant. By truncating the numerators of rational frequencies in lowest terms, the proof reduces higher-moment estimates to counting squarefree denominators in zero-sum relations.

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Xin Hang Ji. 2026-09-13. A Central Limit Theorem for Coprime Pair Counts in Randomly Translated Disks. https://arxiv.org/abs/2609.14224

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