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2022 IMO Problems/Problem 3

Revision as of 09:58, 12 September 2022 by Little-fermat (talk | contribs) (→‎Solution)

Problem

Let $k$ be a positive integer and let $S$ be a finite set of odd prime numbers. Prove that there is at most one way (up to rotation and reflection) to place the elements of $S$ around a circle such that the product of any two neighbours is of the form $x^2 + x + k$ for some positive integer $x$.

Solution

https://www.youtube.com/watch?v=nYD-qIOdi_c [Video contains solutions to all day 1 problems]

https://youtu.be/_kF9uXCZ6l4 [Video Solution by little fermat]

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