olymmath

IMO 2023 Problem 1

  • Day 1

Determine all composite integers n>1n>1 that satisfy the following property: if d1d_1 , d2d_2 , …\ldots , dkd_k are all the positive divisors of nn with 1=d1<d2<⋯<dk=n1 = d_1 < d_2 < \cdots < d_k = n , then did_i divides di+1+di+2d_{i+1} + d_{i+2} for every 1≤i≤k−21 \leq i \leq k - 2 .

Official text Transcription from AI-MO AoPS, checked word for word against the official paper. Quoted with source.

Official text: IMO 2023 official English paper, page 1.

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