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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_09_25_openai: The OpenAI release's Jacobsthal manuscript states in its Theorem 1.2 that one class per prime up to z cannot cover [1, z^2/(log z)^2], so Y(x) = o(x^2) if it stands; unreviewed.
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