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Rapidly converging formulae for $ζ(4k\pm 1)$

Published 9 Mar 2018 in math.NT | (1803.03291v1)

Abstract: We provide rapidly converging formulae for the Riemann zeta function at odd integers using the Lambert series $\mathscr{L}q(s) = \sum{n=1}\infty n{s} q{n}/(1-qn)$, $s=-(4k\pm 1)$. Our main formula for $\zeta(4k-1)$ converges at rate of about $e{-\sqrt{15}\pi}$ per term, and the formula for $\zeta(4k+1)$, at the rate of $e{-4\pi}$ per term. For example, the first order approximation yields $\zeta(3)\approx\frac{\pi 3 \sqrt{15}}{100} +e{-\sqrt{15} \pi }\left[\frac{9}{4}+\frac{4}{\sqrt{15}}\sinh (\frac{\sqrt{15} \pi }{2})\right]$ which has an error only of order $10{-10}$.

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