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DE-BUNDESWETTBEWERB 2014 Problem 4

    Find all postive integers nn for which the number 4n+1n(2n−1)\frac{4n+1}{n(2n-1)} has a terminating decimal expansion.

    Dataset text AI-MO AoPS. Quoted with source.

    Official text: Bundeswettbewerb Mathematik 2014 official paper, page 1.

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    Locator de-bundeswettbewerb/2014/p4 · Tag HMFZY07E67 · Edit this page on GitHub · Keys: j next, k previous