Claim in Erdős problems named in new papers, 2026-10

A published paper or arXiv preprint answers the main question of Erdős Problem #647 (theorem erdos_647 in formal-conjectures) in full (proof, disproof, or the exact value asked for) with no hypotheses beyond the problem's own.

Problem as stated at github.com/google-deepmind/formal-conjectures/blob/34ee0e3c5fd52d202d62a71094a37970cb5fb870/FormalConjectures/ErdosProblems/647.lean. The claim text is written by Corroborate; that site has not reviewed or endorsed it.

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