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Two congruences concerning Apéry numbers

Published 19 Sep 2019 in math.NT and math.CO | (1909.08983v1)

Abstract: Let $n$ be a nonnegative integer. The $n$-th Ap\'{e}ry number is defined by $$ A_n:=\sum_{k=0}n\binom{n+k}{k}2\binom{n}{k}2. $$ Z.-W. Sun ever investigated the congruence properties of Ap\'{e}ry numbers and posed some conjectures. For example, Sun conjectured that for any prime $p\geq7$ $$ \sum_{k=0}{p-1}(2k+1)A_k\equiv p-\frac{7}{2}p2H_{p-1}\pmod{p6} $$ and for any prime $p\geq5$ $$ \sum_{k=0}{p-1}(2k+1)3A_k\equiv p3+4p4H_{p-1}+\frac{6}{5}p8B_{p-5}\pmod{p9}, $$ where $H_n=\sum_{k=1}n1/k$ denotes the $n$-th harmonic number and $B_0,B_1,\ldots$ are the well-known Bernoulli numbers. In this paper we shall confirm these two conjectures.

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