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arXiv · 2611.01282

Small-LCM Distinct Covering Systems via Segmented Local Search

Jiheng Zhang
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Abstract

We construct distinct covering systems with minimum moduli 8, 9, 10, 11 and least common multiples 20160, 75600, 302400, 3326400, respectively, and conjecture that these values are minimal. For minimum modulus 8, the exclusion computations leave only 10080 and 15120 unresolved below our construction. The constructions use segmented local search: moduli are introduced in increasing blocks, followed by joint reoptimization of selected blocks. We give complete residue lists and an independent integer-arithmetic verifier. Two computational studies, comprising 180 initial runs and 130 follow-up runs, compare initialization orders, revisit rules and seed-bank capacities under fixed scan limits.

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Jiheng Zhang. 2026-10-31. Small-LCM Distinct Covering Systems via Segmented Local Search. https://arxiv.org/abs/2611.01282

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