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Proof of a conjectural supercongruence modulo p⁵

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arxiv 2109.09877 v1 pith:SLR37N7G submitted 2021-09-20 math.NT

Proof of a conjectural supercongruence modulo p⁵

classification math.NT
keywords fracsupercongruencebinomconjecturalconjecturedequivmodulopmod
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In this paper we prove the supercongruence $$\sum_{n=0}^{(p-1)/2}\frac{6n+1}{256^n}\binom{2n}n^3\equiv p(-1)^{(p-1)/2}+(-1)^{(p-1)/2}\frac{7}{24}p^4B_{p-3}\pmod{p^5}$$ for any prime $p>3$, which was conjectured by Sun in 2019.

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