In this paper, we study the congruences of the Fourier coefficients of the Mathieu mock theta function, which appears in the Mathieu moonshine phenomenon discovered by Eguchi, Ooguri, and Tachikawa.
"On the Mathieu mock theta function." Proc. Japan Acad. Ser. A Math. Sci. 88 (2) 28 - 30, February 2012. https://doi.org/10.3792/pjaa.88.28