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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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1982_08_01_erdos_sarkozy: The Erdős–Sárközy theorem that, whenever the reciprocal sum f_A(x) of an infinite set A is unbounded, max d_A(n) over n up to x exceeds exp(c (log f_A(x))^2) infinitely often, which answers the question yes.
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