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Some congruences involving binomial coefficients

Hui-Qin Cao, Zhi-Wei Sun (2015)

Colloquium Mathematicae

Binomial coefficients and central trinomial coefficients play important roles in combinatorics. Let p > 3 be a prime. We show that T p - 1 ( p / 3 ) 3 p - 1 ( m o d p ² ) , where the central trinomial coefficient Tₙ is the constant term in the expansion of ( 1 + x + x - 1 ) . We also prove three congruences modulo p³ conjectured by Sun, one of which is k = 0 p - 1 p - 1 k 2 k k ( ( - 1 ) k - ( - 3 ) - k ) ( p / 3 ) ( 3 p - 1 - 1 ) ( m o d p ³ ) . In addition, we get some new combinatorial identities.

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