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Omni-MATH / Find the sum of all positive integers n such that 1+2+⋯+n divides 15[(n+1)²+(n+2)²+⋯+(2n)²] · Discussion

Discussing Find the sum of all positive integers n such that 1+2+⋯+n divides 15[(n+1)²+(n+2)²+⋯+(2n)²] · Omni-MATH

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