Divisibility properties of sporadic Ap\'ery-like numbers
Abstract
In 1982, Gessel showed that the Ap\'ery numbers associated to the irrationality of satisfy Lucas congruences. Our main result is to prove corresponding congruences for all sporadic Ap\'ery-like sequences. In several cases, we are able to employ approaches due to McIntosh, Samol--van Straten and Rowland--Yassawi to establish these congruences. However, for the sequences often labeled and we require a finer analysis. As an application, we investigate modulo which numbers these sequences are periodic. In particular, we show that the Almkvist--Zudilin numbers are periodic modulo , a special property which they share with the Ap\'ery numbers. We also investigate primes which do not divide any term of a given Ap\'ery-like sequence.
Keywords
Cite
@article{arxiv.1508.00297,
title = {Divisibility properties of sporadic Ap\'ery-like numbers},
author = {Amita Malik and Armin Straub},
journal= {arXiv preprint arXiv:1508.00297},
year = {2015}
}
Comments
30 pages, 1 figure