olymmath

SE-SKOLORNAS 2019 Problem 6

    Is there an infinite sequence of positive integers {an}n=1∞\{a_n\}_{n = 1}^{\infty} which contains each positive integer exactly once and is such that the number an+an+1a_n + a_{n + 1} is a perfect square for each nn ?

    Dataset text AI-MO AoPS. Quoted with source.

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