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arXiv · 2508.02818

Numbers with Four Close Factorizations

Tsz Ho Chan·Laura Holmes·Michael Liu·Jose Villarreal
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Abstract

In this paper, we study numbers $n$ that can be factored in four different ways as $n = A B = (A + a_1) (B - b_1) = (A + a_2) (B - b_2) = (A + a_3) (B - b_3)$ with $B \le A$, $1 \le a_1 < a_2 < a_3 \le C$ and $1 \le b_1 < b_2 < b_3 \le C$. We obtain the optimal upper bound $A \le 0.04742 \ldots \cdot C^3 + O(C)$. The key idea is to transform the original question into generalized Pell equations $a x^2 - b y^2 = c$ and study their solutions.

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Tsz Ho Chan, Laura Holmes, Michael Liu, Jose Villarreal. 2025-08-04. Numbers with Four Close Factorizations. https://arxiv.org/abs/2508.02818

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