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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_29_feng: Feng et al.'s Theorem 5, found by the Aletheia agent: a constant-weight lower construction meets the Bannai–Bannai–Stanton upper bound, so for n at least 2 the ratio g_d(n)/d^(n-1) tends to 1/(n-1)!.