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 A242967 #7 Feb 16 2025 08:33:22 %S A242967 1,7,6,4,2,9,7,3,3,1,3,0,8,0,2,4,3,0,3,4,4,2,9,4,8,0,4,7,6,1,6,7,0,3, %T A242967 0,2,3,6,1,7,8,1,4,8,8,2,8,0,0,6,9,6,2,5,2,0,1,0,3,1,9,9,1,3,2,5,8,1, %U A242967 2,3,5,1,1,5,1,9,5,4,4,7,2,0,6,0,5,4,1,0,3,6,3,6,3,2,9,3,8,1,5,9,6 %N A242967 Decimal expansion of H, an auxiliary constant used to evaluate some Ising-related constants on triangular and hexagonal lattices (negated). %D A242967 Steven R. Finch, Mathematical Constants, Cambridge University Press, 2003, Section 5.22 Lenz-Ising constants, p. 400. %H A242967 Eric Weisstein's MathWorld, <a href="https://mathworld.wolfram.com/DigammaFunction.html">Digamma Function</a> %F A242967 sqrt(3)/(6*Pi)*psi'(1/6) - Pi/sqrt(3) - log(6), where psi' is the derivative of the digamma function. %e A242967 -0.1764297331308024303442948047616703... %t A242967 Sqrt[3]/(6*Pi)*PolyGamma[1, 1/6] - Pi/Sqrt[3] - Log[6] // RealDigits[#, 10, 101]& // First %K A242967 nonn,cons %O A242967 0,2 %A A242967 _Jean-François Alcover_, May 28 2014