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PMO 2023 Problem 7

    A set of positive integers is said to be pilak if it can be partitioned into 2 disjoint subsets FF and TT , each with at least 22 elements, such that the elements of FF are consecutive Fibonacci numbers, and the elements of TT are consecutive triangular numbers. Find all positive integers nn such that the set containing all the positive divisors of nn except nn itself is pilak.

    Dataset text AI-MO AoPS. Quoted with source.

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