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Arithmetic properties of Apéry-like numbers

Part of: Combinatorics Sequences and sets

Published online by Cambridge University Press:  20 October 2017

É. Delaygue
É. Delaygue*
Affiliation:
Institut Camille Jordan, Université Claude Bernard Lyon 1, 43 boulevard du 11 Novembre 1918, 69622 Villeurbanne cedex, France email delaygue@math.univ-lyon1.fr
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Abstract

We provide lower bounds for $p$ -adic valuations of multisums of factorial ratios which satisfy an Apéry-like recurrence relation: these include Apéry, Domb and Franel numbers, the numbers of abelian squares over a finite alphabet, and constant terms of powers of certain Laurent polynomials. In particular, we prove Beukers’ conjectures on the $p$ -adic valuation of Apéry numbers. Furthermore, we give an effective criterion for a sequence of factorial ratios to satisfy the $p$ -Lucas property for almost all primes $p$ .

Keywords

Apéry numbersconstant terms of powers of Laurent polynomialsp-Lucas propertycongruences

MSC classification

Primary: 11B50: Sequences (mod $m$)
Secondary: 11B65: Binomial coefficients; factorials; $q$-identities 05A10: Factorials, binomial coefficients, combinatorial functions

Information

Type
Research Article
Information
Compositio Mathematica , Volume 154 , Issue 2 , February 2018 , pp. 249 - 274
Copyright
© The Author 2017 

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