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 A223710 #17 Oct 01 2022 00:12:04 %S A223710 8,1,4,9,4,2,1,4,6,7,7,3,3,2,6,3,0,1,1,4,8,8,5,3,6,1,6,6,7,9,2,1,4,1, %T A223710 6,0,9,0,7,3,9,7,0,6,9,7,0,5,1,5,7,7,2,1,1,6,2,8,3,8,5,3,3,0,9,8,8,6, %U A223710 5,2,0,1,1,8,6,8,5,9,4,1,5,7,0,5,8,8,9 %N A223710 Decimal expansion of (Pi-2)*(Pi-1)/3. %D A223710 Tom M. Apostol, Calculus, Vol. 1, John Wiley & Sons, 1967 (2nd ed.). This constant is the case s=2, t=3 in sum(sin(n*s)/n^t, n>=1), see p. 409. %H A223710 Vincenzo Librandi, <a href="/A223710/b223710.txt">Table of n, a(n) for n = 0..1000</a> %H A223710 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a> %F A223710 Equals sum(sin(2*k)/k^3, k>=1). %e A223710 0.8149421467733263011488536166792141609073970697051577... %t A223710 RealDigits[(Pi - 2) (Pi - 1)/3, 10, 90][[1]] %Y A223710 Cf. A096444, A217909, A223709. %K A223710 nonn,cons %O A223710 0,1 %A A223710 _Bruno Berselli_, Mar 26 2013