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 A088374 #15 Feb 16 2025 08:32:51
%S A088374 1,4,0,4,9,0,9,1,3,2,7,3,5,7,9,5,5,3,5,5,2,5,4,4,8,1,5,0,6,1,4,6,5,4,
%T A088374 3,4,2,7,8,1,3,4,7,6,8,0,1,8,4,1,0,8,9,5,0,5,6,8,1,1,1,6,4,1,0,6,4,9,
%U A088374 2,8,5,4,2,9,1,8,8,7,5,4,1,5,1,1,5,2,3,4,6,0,5,2,7,2,4,6,6,8,3,7,2,6
%N A088374 Decimal expansion of a postulated upper estimate for the complex Grothendieck constant.
%H A088374 G. C. Greubel, <a href="/A088374/b088374.txt">Table of n, a(n) for n = 1..10000</a>
%H A088374 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/GrothendiecksConstant.html">Grothendieck's Constant</a>
%e A088374 1.4049091327357955...
%t A088374 psi[x_] := (Sqrt[1 - x^2]*(EllipticE[-x^2/(1 - x^2)] - EllipticK[-x^2/(1 - x^2)]))/x; x0 = x /. FindRoot[psi[x] == 1/8*Pi*(x + 1), {x, 1/2}, WorkingPrecision -> 110]; RealDigits[8/(Pi*(x0 + 1)), 10, 102] // First (* _Jean-François Alcover_, Feb 06 2013 *)
%Y A088374 Cf. A088367, A088373, A088375.
%K A088374 nonn,cons
%O A088374 1,2
%A A088374 _Eric W. Weisstein_, Sep 28 2003