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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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1977_01_01_graham_witsenhausen_spencer: Graham, Witsenhausen and Spencer proved that the limiting density of sets with no triple n, 2n, 3n exists and equals one third of a series over the 3-smooth numbers; the collected volume is not shown to be refereed.
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