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Research notes on every problem, and a library of the papers behind them. Built from the open erdos repository.

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2026_01_17_somani: Neel Somani's argument, produced with GPT-5.2 Pro and posted on the site, proves the answer yes through Haar measure on the profinite integers, an averaging argument and Dini's theorem; accepted on the curator's credit.

2026_01_18_koishichan: KoishiChan's observation on the site that the Davenport-Erdős theorem on sets of multiples and Rogers' theorem on zero residues together answer the question yes in a few lines; accepted on the curator's credit.