Congruences for coefficients of modular functions in levels 3, 5, and 7 with poles at 0 (2001.04337v2)

Abstract: We give congruences modulo powers of $p \in {3, 5,7}$ for the Fourier coefficients of certain modular functions in level $p$ with poles only at 0, answering a question posed by Andersen and the first author and continuing work done by the authors and Moss. The congruences involve a modulus that depends on the base $p$ expansion of the modular form's order of vanishing at $\infty$.