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 A248914 #16 Nov 11 2024 21:19:45
%S A248914 1,4,0,3,8,2,1,9,6,5,1,5,5,3,5,5,1,6,5,7,3,0,3,6,3,7,3,8,8,9,9,6,1,0,
%T A248914 2,7,7,4,8,0,0,3,5,3,2,8,3,0,6,6,5,7,0,2,2,0,7,0,0,0,4,5,5,7,2,5,8,4,
%U A248914 8,6,4,0,8,1,3,7,8,1,3,4,8,0,0,2,3,0,0,2,9,0,8,4,7,6,6,2,7,4,4,9,2
%N A248914 Decimal expansion of L = Integral_{t=0..1} 1/(1-2t^2/3) dt, an auxiliary constant associated with one of the integral inequalities studied by David Boyd.
%D A248914 Steven R. Finch, Mathematical Constants, Cambridge University Press, 2003, Section 3.6 Sobolev Isoperimetric Constants.
%H A248914 David W. Boyd, <a href="http://projecteuclid.org/euclid.pjm/1102978495">Best constants in a class of integral inequalities</a>, Pacific J. Math. Volume 30, Number 2 (1969), 367-383
%H A248914 Steven R. Finch, <a href="http://arxiv.org/abs/2001.00578">Errata and Addenda to Mathematical Constants</a>, p. 31.
%F A248914 L = sqrt(3/2)*arctanh(sqrt(2/3)).
%F A248914 K = A246859 = 2/(L+1)^2.
%e A248914 1.40382196515535516573036373889961027748003532830665702207...
%t A248914 RealDigits[Sqrt[3/2]*ArcTanh[Sqrt[2/3]], 10, 101] // First
%Y A248914 Cf. A242440, A244263, A244347, A244354, A245292, A246859.
%K A248914 nonn,cons,easy
%O A248914 1,2
%A A248914 _Jean-François Alcover_, Oct 16 2014