Partitions into Triples with Equal Products and Families of Elliptic Curves

Let $S_l(M,N)$ denote a set of $\ell$ triples of positive integers whose parts have the same sum $M$ and the same product $N$. For each $2\leq\ell\leq 4$ we establish a connection between the set $S_l(M,N)$ and a family of elliptic curves. When $\ell=2$ and $3$, we use certain known parametrised sets $S_l(M,N)$ and respectively find families of elliptic curves of generic rank~$\geq 5$ and $\geq 6$, while for $\ell=4$ we first obtain a parametrised set $S_l(M,N)$, then construct a family of elliptic curves of generic rank $\geq 8$. Finally, we perform a computer search within these families to find specific curves with rank~$\geq 11$. The highest rank examples we found were two curves of rank~$14$.
Comment: 11 pages, 4 tables