MathSciNet bibliographic data MR2744766 11Y60 (65B10) Sondow, Jonathan New Vacca-type rational series for Euler's constant $\gamma$$\gamma$ and its "alternating'' analog $\ln\frac4\pi$$\ln\frac4\pi$. Additive number theory, 331–340, Springer, New York, 2010. Article

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