@Article{JMS-56-2, author = {Mao, Guo-Shuai and Yan, Liu}, title = {Congruences Involving Hecke-Rogers Type Series and Modular Forms}, journal = {Journal of Mathematical Study}, year = {2023}, volume = {56}, number = {2}, pages = {147--155}, abstract = {
In this paper, we prove two supercongruences of Hecke-Rogers type series
and Modular forms conjectured by Chan, Cooper and Sica, such as, if
$$z_2=\sum_{m=-∞}^{\infty}\sum_{n=-\infty}^{\infty} q^{m^2+n^2}, x_2=\frac{\eta^{12}(2\tau)}{z_2^6}$$
and
$$z_2=\sum_{n=0}^{\infty}f_{2,n}x_2^n,$$
then
$$f_{2,pn}\equiv f_{2,n} (mod \ p^2) \ \ when \ \ p\equiv 1(mod \ 4),$$ where
$$\eta(\tau)=q^{\frac{1}{24}} \Pi_{n=1}^{\infty}(1-q^n),$$
and $q=exp(2πiτ)$ with $Im(τ)>0.$