English

On the $p$-adic valuation of a hyperfactorial

Number Theory 2021-09-14 v1

Abstract

In this document will be proved a formula to compute the pp-adic valuation of a hyperfactorial. We call a hyperfactorial the result of multiplying a given number of consecutive integers from 1 to the given number,each raised to its own power. For example, the hyperfactorial of nn is equal to: 112233nn1^1 2^2 3^3\dots n^n . Lots of studies have been done about the hyperfactorial function, in particular two mathematicians: Glaisher and Kinkelin, who have found the asymptotic behaviour of this function as nn that approaches infinity (finding a costant, the Glaisher-Kinkelin costant, which has a lot of expressions using the Euler Gamma function and the Riemann Zeta function). In particular in this document I'll write about the p-adic valuation of this function, or rather the maximum exponent of pp(pp a prime integer) such that pp raised to that power divides the hyperfactorial of nn. The formula which I will present uses the famous De-Polignac formula for the pp-adic valuation of the simple factorial. Then I'll discuss about the asymptotic analysis of our result.

Keywords

Cite

@article{arxiv.2109.05616,
  title  = {On the $p$-adic valuation of a hyperfactorial},
  author = {Luca Onnis},
  journal= {arXiv preprint arXiv:2109.05616},
  year   = {2021}
}

Comments

6 pages, 3 figures

R2 v1 2026-06-24T05:53:56.650Z