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More congruences for central binomial coefficients - MaRDI portal

More congruences for central binomial coefficients (Q710499)

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scientific article; zbMATH DE number 5802575
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English
More congruences for central binomial coefficients
scientific article; zbMATH DE number 5802575

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    More congruences for central binomial coefficients (English)
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    19 October 2010
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    Let \(p>5\) be a prime number. The author proves that \[ \sum_{k=1}^{p-1}\frac{1}{k^2}\binom{2k}{k}^{-1}\equiv\frac13 \frac{H(1)}{p}\pmod {p^3} \] and that \[ \sum_{k=1}^{p-1}\frac{(-1)^k}{k^3}\binom{2k}{k}^{-1}\equiv-\frac25 \frac{H(1)}{p^2}\pmod {p^3}, \] where \(H(1)=\sum_{k=1}^{p-1}\frac{1}{k}\).
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    binomial coefficients
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    congruences
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