This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A244345 #6 Feb 16 2025 08:33:23 %S A244345 5,0,7,4,7,0,8,0,3,2,0,4,8,2,6,8,1,2,5,1,0,6,0,1,2,7,7,1,3,7,2,6,0,1, %T A244345 4,2,9,7,0,8,4,4,6,5,3,7,6,5,1,4,9,8,9,6,0,0,8,7,4,4,5,5,3,3,8,8,2,9, %U A244345 8,7,3,8,1,2,9,1,2,2,0,1,1,0,6,8,2,3,5,1,7,7,1,1,4,1,2,8,3,4,7,4,7,2,9,3 %N A244345 Decimal expansion of xi_3 = 5*G, the volume of an ideal hyperbolic cube, where G is Gieseking's constant. %D A244345 Steven R. Finch, Mathematical Constants, Cambridge, 2003, Section 8.9 Hyperbolic Volume Constants p. 512. %H A244345 Eric Weisstein's MathWorld, <a href="https://mathworld.wolfram.com/GiesekingsConstant.html">Gieseking's Constant</a> %H A244345 Eric Weisstein's MathWorld, <a href="https://mathworld.wolfram.com/PolygammaFunction.html">Polygamma Function</a> %F A244345 5*(9 - Polygamma(1, 2/3) + Polygamma(1, 4/3)) / (4*sqrt(3)). %e A244345 5.0747080320482681251060127713726... %t A244345 G = (9 - PolyGamma[1, 2/3] + PolyGamma[1, 4/3])/(4*Sqrt[3]); RealDigits[5*G, 10, 104] // First %Y A244345 Cf. A143298, A242710. %K A244345 nonn,cons %O A244345 1,1 %A A244345 _Jean-François Alcover_, Jun 26 2014