English

The zeta-regularized product of odious numbers

Number Theory 2021-03-23 v2

Abstract

What is the product of all {\em odious} integers, i.e., of all integers whose binary expansion contains an odd number of 11's? Or more precisely, how to define a product of these integers which is not infinite, but still has a "reasonable" definition? We will answer this question by proving that this product is equal to π1/42φeγ\pi^{1/4} \sqrt{2 \varphi e^{-\gamma}}, where γ\gamma and φ\varphi are respectively the Euler-Mascheroni and the Flajolet-Martin constants.

Keywords

Cite

@article{arxiv.1906.10532,
  title  = {The zeta-regularized product of odious numbers},
  author = {J. -P. Allouche},
  journal= {arXiv preprint arXiv:1906.10532},
  year   = {2021}
}