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RS-SMO 2024 Problem 1

    Find all positive integers nn , such that if their divisors are 1=d1<d2<…<dk=n1=d_1<d_2<\ldots<d_k=n for k≥4k \geq 4 , then the numbers d2−d1,d3−d2,…,dk−dk−1d_2-d_1, d_3-d_2, \ldots, d_k-d_{k-1} form a geometric progression in some order.

    Dataset text AI-MO AoPS. Quoted with source.

    Official text: Serbian Mathematical Olympiad 2024 official paper, page 1.

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