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A q-analog of Ljunggren's binomial congruence
Armin Straub — Discrete Mathematics and Theoretical Computer Science — Special volume for FPSAC 2011 — 2011, Pages 897-902

Abstract

We prove a

q

-analog of a classical binomial congruence due to Ljunggren which states that

\binom{a p}{b p} \equiv \binom{a}{b}

modulo

p^3

for primes

p\ge5

. This congruence subsumes and builds on earlier congruences by Babbage, Wolstenholme and Glaisher for which we recall existing

q

-analogs. Our congruence generalizes an earlier result of Clark.

http://dmtcs.episciences.org/2962

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BibTeX

@article{qljunggren-2011,
    author = {Armin Straub},
    title = {A $q$-analog of {L}junggren's binomial congruence},
    journal = {Discrete Mathematics and Theoretical Computer Science},
    year = {2011},
    pages = {897--902},
}