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AIME 2019b Problem 12

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For n≥1n \ge 1 call a finite sequence (a1,a2…an)(a_1, a_2 \ldots a_n) of positive integers progressive if ai<ai+1a_i < a_{i+1} and aia_i divides ai+1a_{i+1} for all 1≤i≤n−11 \le i \le n-1. Find the number of progressive sequences such that the sum of the terms in the sequence is equal to 360360.

Dataset text AIME 1983 to 2026. Quoted with source.

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