Analogue of Ramanujan's function $k(\tau)$ for the continued fraction of order six

Abstract

The Ramanujan's $k(\tau)$ function is defined as $k(\tau)=r(\tau)r(2\tau)^2$, where $r(\tau)$ is the Rogers-Ramanujan continued fraction. Inspired by the recent work of Park (2023) about the analogue of function $k(\tau)$ for the Ramanujan cubic continued fraction, we study certain modular and arithmetic properties of the function $w(\tau) = X(\tau)X(3\tau)$, where $X(\tau)$ is the continued fraction of order six introduced by Vasuki, Bhaskar and Sharath (2010). We consider $w(\tau)$ to be an analogue of $k(\tau)$ for the continued fraction $X(\tau)$