NEW INFINITE FAMILIES OF CONGRUENCES MODULO 4 AND 8 FOR 1-SHELL TOTALLY SYMMETRIC PLANE PARTITIONS

In 2012, Blecher [‘Geometry for totally symmetric plane partitions (TSPPs) with self-conjugate main diagonal’,Util. Math. 88(2012), 223–235] introduced a special class of totally symmetric plane partitions, called$\def \xmlpi #1{}\def \mathsfbi #1{\boldsymbol {\mathsf {#1}}}\let \le =\leqslant \let \leq =\leqslant \let \ge =\geqslant \let \geq =\geqslant \def \Pr {\mathit {Pr}}\def \Fr {\mathit {Fr}}\def \Rey {\mathit {Re}}1$-shell totally symmetric plane partitions. Let$f(n)$denote the number of$1$-shell totally symmetric plane partitions of weight$n$. More recently, Hirschhorn and Sellers [‘Arithmetic properties of 1-shell totally symmetric plane partitions’,Bull. Aust. Math. Soc.to appear. Published online 27 September 2013] discovered a number of arithmetic properties satisfied by$f(n)$. In this paper, employing some results due to Cui and Gu [‘Arithmetic properties of$l$-regular partitions’,Adv. Appl. Math. 51(2013), 507–523], and Hirschhorn and Sellers, we prove several new infinite families of congruences modulo 4 and 8 for$1$-shell totally symmetric plane partitions. For example, we find that, for$n\geq 0$and$\alpha \geq 1$,$$\begin{equation*} f(8 \times 5^{2\alpha } n+39\times 5^{2\alpha -1})\equiv 0 \pmod 8. \end{equation*}$$