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 A217909 #19 Oct 01 2022 01:01:32 %S A217909 1,1,6,2,1,8,7,2,9,9,6,7,6,4,4,5,2,2,8,7,6,2,9,7,8,8,7,5,5,9,1,9,4,0, %T A217909 7,8,2,1,3,2,1,8,5,5,5,0,2,6,4,0,7,2,1,6,0,1,3,0,4,9,3,5,5,4,1,7,4,3, %U A217909 5,4,9,7,0,6,5,6,3,2,3,7,4,5,8,7,8,0,8 %N A217909 Decimal expansion of (Pi-3)*(2*Pi-3)/4. %D A217909 Tom M. Apostol, Calculus, Vol. 1, John Wiley & Sons, 1967 (2nd ed.). This constant is the case s=t=3 in sum(sin(n*s)/n^t, n>=1), see p. 409. %H A217909 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a> %F A217909 Equals sum(sin(3*k)/k^3, k>=1). %e A217909 0.1162187299676445228762978875591940782132185550264072... %t A217909 RealDigits[(Pi - 3) (2 Pi - 3)/4, 10, 90][[1]] %Y A217909 Cf. A096444, A223709, A223710. %K A217909 nonn,cons %O A217909 0,3 %A A217909 _Bruno Berselli_, Mar 25 2013