Supercongruences satisfied by coefficients of 2F1 hypergeometric series
arXiv:0912.0620
Abstract
Recently, Chan, Cooper and Sica conjectured two congruences for coefficients of classical 2F1 hypergeometric series which also arise from power series expansions of modular forms in terms of modular functions. We prove these two congruences using combinatorial properties of the coefficients.
13 pages