Erdős Problem #586 — Primitive covering systems
Does there exist a covering system of the integers in which no modulus divides any other modulus?
References
Additional references
P. Balister, B. Bollobás, R. Morris, J. Sahasrabudhe, and M. Tiba, On the Erdős covering problem: the density of the uncovered set, Inventiones Mathematicae 228 (2022), 377–414.
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