• Cite Icon4
  • https://doi.org/10.1007/s11139-022-00683-0Copy DOI Icon

On Robin’s inequality

Show More
  • Abstract
  • PDF
  • Literature Map
  • References
  • Citations
  • Similar Papers
Abstract

Let sigma (n) denote the sum of divisors function of a positive integer n. Robin proved that the Riemann hypothesis is true if and only if the inequality sigma (n) < textrm{e}^{gamma }n log log n holds for every integer n > 5040, where gamma is the Euler–Mascheroni constant. In this paper we establish a new family of integers for which Robin’s inequality sigma (n) < textrm{e}^{gamma }n log log n hold. Further, we establish a new unconditional upper bound for the sum of divisors function. For this purpose, we use an approximation for Chebyshev’s vartheta -function and for some product defined over prime numbers.

Loading PDF

Similar Papers
  • Research Article
  • Citations6

Limits and inequalities associated with the Euler–Mascheroni constant

  • Apr 18, 2013
  • Applied Mathematics and Computation
  • Chao-Ping Chen +1
  • Research Article
  • Citations5

Generalizing Riemann: from the L -functions to the Birch/Swinnerton-Dyer conjecture

  • Oct 01, 2010
  • Journal of Interdisciplinary Mathematics
  • David F Haight
  • Research Article

HOW MULTIPLE BRANCHES OF MATHEMATICS UNITE THE MOBIUS STRIP WITH MULTIPLE PHENOMENA IN PHYSICS AND COSMOLOGY

  • Aug 25, 2023
  • IJRDO -JOURNAL OF MATHEMATICS
  • Rodney Bartlett
  • Research Article
  • Citations2

ON STRATEGIES TOWARDS THE RIEMANN HYPOTHESIS: FRACTAL SUPERSYMMETRIC QM AND A TRACE FORMULA

  • Aug 01, 2007
  • International Journal of Geometric Methods in Modern Physics
  • Carlos Castro
  • Research Article
  • Citations10

Majorana quanta, string scattering, curved spacetimes and the Riemann Hypothesis

  • Dec 01, 2021
  • Physica Scripta
  • Fabrizio Tamburini +1
  • Supplementary Content

New Formulas for the Euler-Mascheroni Constant and other Consequences derived from the Acceptance of Hyperbolicity of Jensen Polynomials and the Analysis of the Tur\'an Moments for the {\xi}-Function

  • Dec 20, 2021
  • arXiv (Cornell University)
  • Nikos Mantzakouras +1
  • Research Article
  • Citations16

On the Constants of the Bohnenblust–Hille and Hardy–Littlewood Inequalities

  • Oct 25, 2016
  • Bulletin of the Brazilian Mathematical Society, New Series
  • Gustavo Araújo +1
  • PDF
  • Research Article
  • Citations4

Motion of a disk embedded in a nearly inviscid Langmuir film. Part 1. Translation

  • Dec 18, 2023
  • Journal of Fluid Mechanics
  • Ehud Yariv +3
  • Research Article
  • Citations5

Ramanujan’s formula for the harmonic number

  • Sep 21, 2017
  • Applied Mathematics and Computation
  • Chao-Ping Chen
  • Research Article

An In-Depth Investigation of the Riemann Zeta Function Using Infinite Numbers

  • Apr 30, 2025
  • Mathematics
  • Emmanuel Thalassinakis
  • PDF
  • Research Article

Median Bernoulli Numbers and Ramanujan’s Harmonic Number Expansion

  • Jun 12, 2022
  • Mathematics
  • Kwang-Wu Chen
  • Research Article
  • Citations17

Inequalities and monotonicity properties for the psi (or digamma) function and estimates for the Euler–Mascheroni constant

  • Feb 10, 2011
  • Integral Transforms and Special Functions
  • Chao-Ping Chen +3
  • PDF
  • Research Article
  • Citations1

A New Sequence Which Converges Faster towards the Euler–Mascheroni Constant

  • Aug 17, 2023
  • Journal of Mathematics
  • Jenica Cringanu
  • Research Article
  • Citations7

Estimations of psi function and harmonic numbers

  • Feb 25, 2015
  • Applied Mathematics and Computation
  • Neven Elezović
  • Conference Article
  • Citations28

New types of finite groups and generated algorithm to determine the integer factorization by Excel

  • Jan 01, 2020
  • AIP conference proceedings
  • Modhar Mohammed Torki +1
Cactus Communications logo

Copyright 2026 Cactus Communications. All rights reserved.