ISL 2021 N3
Find all positive integers with the following property: the positive divisors of have a permutation such that for every , the number is a perfect square.
Official text Transcription from NuminaMath olympiads, checked word for word against the official paper. Quoted with source.
Official text: IMO 2021 Shortlist booklet, page 10.
Solutions
Official solution Solution 1 by the IMO Problem Selection Committee
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