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CONO-SUR 2023 Problem 4

    Consideramos a sequência de números inteiros definida por a1=1,a2=2a_1 = 1, a_2 = 2, e para cada n≥2n \geq 2, an+1a_{n+1} é o maior divisor primo de a1+a2+…+ana_1 + a_2 + \ldots + a_n. Calcule a100a_{100}.

    Official text Cono Sur Mathematical Olympiad 2023 official paper, page 2. Quoted with source.

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