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Omni-MATH / Determine all integers s≥4 for which there exist positive integers a, b, c, d such that s=a+b+c+d and s divides abc+abd+acd+bcd. · Discussion
Discussing Determine all integers s≥4 for which there exist positive integers a, b, c, d such that s=a+b+c+d and s divides abc+abd+acd+bcd. · Omni-MATH
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