Reciprocals of Subsum Polynomials

Abstract

We introduce the subsum polynomial of a partition $λ=(λ_1, λ_2, \ldots, λ_k)$ defined by $\mathrm{sp}(λ, x)=\prod_{i=1}^k(1+x^{λ_i})$. We study the sum of reciprocals of $\mathrm{sp}(λ, x)$ over all partitions of $n$. We prove arithmetic properties of related polynomials and offer connections to other combinatorial objects.