Generalized nonintegrality conjecture for multiple reciprocal sums of polynomials

Let f(x)f(x) be a nonzero polynomial of integer coefficients. Let Zf:={xZ:f(x)=0}Z_f:=\{x\in\mathbb{Z}:f(x)=0\}, let {ak}k=1:=Z+Zf\{a_k\}_{k=1}^{\infty}:=\mathbb{Z}^+\setminus Z_f be arranged in increasing order, and define

Mk,f(s,n):=1i1<<iknj=1k1f(aij)sj,M_{k,f}(\vec{s},n):=\sum_{1\leq i_1<\cdots<i_k\leq n}\prod_{j=1}^k\frac{1}{f(a_{i_j})^{s_j}}, Mk,f(s,n):=1i1iknj=1k1f(aij)sj.M_{k,f}^*(\vec{s},n):=\sum_{1\leq i_1\leq\cdots\leq i_k\leq n}\prod_{j=1}^k\frac{1}{f(a_{i_j})^{s_j}}.

Let {si}i=1\{s_i\}_{i=1}^{\infty} be an infinite sequence of positive integers, and write s(k):=(s1,,sk)\vec{s}^{(k)}:=(s_1,\ldots,s_k). Generalized nonintegrality conjecture. There is a positive integer NN such that for every integer nNn\geq N and every integer kk with 1kn1\leq k\leq n, neither Mk,f(s(k),n)M_{k,f}(\vec{s}^{(k)},n) nor Mk,f(s(k),n)M_{k,f}^*(\vec{s}^{(k)},n) is an integer. The sequence need not be increasing or have distinct terms. This conjecture generalizes Conjecture 3.1 of the cited work and extends the expected eventual nonintegrality of multiple reciprocal sums and star sums to arbitrary nonzero integer polynomials, including polynomials with integer roots.

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Primary source

Shaofang Hong, Liping Yang, Qiuyu Yin and Min Qiu, “Multiple reciprocal sums and multiple reciprocal star sums of polynomials are almost never integers”, arXiv:1703.07263 (2018).

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