olymmath

IMO 2005 Problem 4

  • Day 2
  • Answer

Determine all positive integers relatively prime to all the terms of the infinite sequence

an=2n+3n+6n−1,n≥1.a_{n} = 2^{n} + 3^{n} + 6^{n} - 1, n\geq 1.

Official text Transcription from NuminaMath olympiads, checked word for word against the official paper. Quoted with source.

Official text: IMO 2005 official English paper, page 1.

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