Generalized nonintegrality conjecture for reciprocal power sums

Let f(x)f(x) be a nonzero polynomial with integer coefficients and let S={si}i=1\mathcal{S}=\{s_i\}_{i=1}^{\infty} be an infinite sequence of positive integers, not necessarily increasing or distinct. For each nn, write Sn=(s1,,sn)\mathcal{S}_n=(s_1,\ldots,s_n), and for 1kn1\leq k\leq n define

Hf(k)(Sn):=1i1<<iknj=1k1f(aij)sij,H_f^{(k)}(\mathcal{S}_n):=\sum_{1\leq i_1<\cdots<i_k\leq n}\prod_{j=1}^k\frac{1}{f(a_{i_j})^{s_{i_j}}},

where Zf={xZ:f(x)=0}Z_f=\{x\in\mathbb{Z}:f(x)=0\}, {ai}i=1=Z+Zf\{a_i\}_{i=1}^{\infty}=\mathbb{Z}^+\setminus Z_f is in increasing order, and

Hˉf(k)(Sn):=1i1iknj=1k1f(aij)sij.\bar H_f^{(k)}(\mathcal{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_{i_j}}}.

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 Hf(k)(Sn)H_f^{(k)}(\mathcal{S}_n) nor Hˉf(k)(Sn)\bar H_f^{(k)}(\mathcal{S}_n) is an integer.

This conjecture generalizes the two earlier conjectures cited in the source and extends the nonintegrality problem to arbitrary nonzero integer polynomials and arbitrary positive-integer exponent sequences. Its status is not established in the supplied text.

Sources & referencesView supporting material

Primary source

Junyong Zhao, Shaofang Hong and Xiao Jiang, “A certain reciprocal power sum is never an integer”, arXiv:1812.08705 (2018).

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