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Erdős problem / erdos

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Problem 888

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  1. vf_5ad19e56413bb00d

    theoretical

    Erdős Problem #888: declared status 'solved'. Formalized: yes. What is the size of the largest A⊆{1,…,n}A\subseteq \{1,\ldots,n\} such that if a≤b≤c≤d∈Aa\leq b\leq c\leq d\in A are such that abcdabcd is a square then ad=bcad=bc? Prize: no. OEIS: A387584. Tags: number theory, squares.

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