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arxiv: 1508.00297 · v1 · pith:PZT4ZKD4new · submitted 2015-08-03 · 🧮 math.NT · math.CO

Divisibility properties of sporadic Ap\'ery-like numbers

classification 🧮 math.NT math.CO
keywords numberscongruencesery-likesequencesinvestigatemoduloperiodicsporadic
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In 1982, Gessel showed that the Ap\'ery numbers associated to the irrationality of $\zeta(3)$ 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 $s_{18}$ and $(\eta)$ 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 $8$, 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.

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