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On odd covering systems with distinct moduli

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arxiv math/0412217 v2 pith:6E5S5B26 submitted 2004-12-10 math.NT math.CO

On odd covering systems with distinct moduli

classification math.NT math.CO
keywords coveringdistinctleastmodulisystemcommonconjecturedivisors
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A famous unsolved conjecture of P. Erdos and J. L. Selfridge states that there does not exist a covering system {a_s(mod n_s)}_{s=1}^k with the moduli n_1,...,n_k odd, distinct and greater than one. In this paper we show that if such a covering system {a_s(mod n_s)}_{s=1}^k exists with n_1,...,n_k all square-free, then the least common multiple of n_1,...,n_k has at least 22 prime divisors.

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