Extreme values of the Dedekind $Ψ$ function

Details Extreme values of the Dedekind $Ψ$ function Extreme values of the Dedekind $Ψ$ function

2010-11-08

arxiv.org/abs/1011.1825v2

Journal of Combinatorics and Number Theory 3, 1 (2011) 1-6

Mathematics

Number Theory

5 pages, to appear in Journal of Combinatorics and Number theory

Scientific paper

Let $\Psi(n):=n\prod_{p | n}(1+\frac{1}{p})$ denote the Dedekind $\Psi$ function. Define, for $n\ge 3,$ the ratio $R(n):=\frac{\Psi(n)}{n\log\log n}.$ We prove unconditionally that $R(n)< e^\gamma$ for $n\ge 31.$ Let $N_n=2...p_n$ be the primorial of order $n.$ We prove that the statement $R(N_n)>\frac{e^\gamma}{\zeta(2)}$ for $n\ge 3$ is equivalent to the Riemann Hypothesis.

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