Mprime Seminar Series on Mathematics of Computer Algebra and Analysis

A method for determining the mod-2k behaviour of (certain) recursive sequences.

Professor Christian Krattenthaler

Fakultät für Mathematik, Universität Wien.

3:30pm, Wednesday February 1, 2012, in K9509.


I shall present a (computer-supported) method to obtain
congruences modulo powers of 2 for sequences given by recurrences
of finite depth with polynomial coefficients. I shall illustrate the
method by applying it to Catalan numbers, and to subgroup counting
functions associated with Hecke groups and related groups.
Thereby numerous new results are obtained, including many
extensions of known results to higher powers of 2.
This is joint work with Thomas Müller.