olymmath

IR-TST 2019 Problem 14

  • Test 3

Hesam chose 1010 distinct positive integers and he gave all pairwise gcd⁡\gcd 's and pairwise lcm{\text lcm} 's (a total of 9090 numbers) to Masoud. Can Masoud always find the first 1010 numbers, just by knowing these 9090 numbers?

Proposed by Morteza Saghafian

Dataset text AI-MO AoPS. Quoted with source.

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