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 A373018 #4 Jul 19 2024 19:16:25
%S A373018 7,4,2,3,0,7,4,8,8,9,5,8,0,9,0,2,6,8,6,5,4,6,1,9,8,6,0,6,4,5,3,7,3,8,
%T A373018 7,1,5,4,6,9,1,6,5,3,7,3,4,7,3,0,5,9,8,3,4,5,2,4,8,8,7,0,5,4,7,9,3,9,
%U A373018 9,8,6,4,3,8,9,4,8,5,7,3,0,1,7,7,6,3
%N A373018 Decimal expansion of Sum_{k>=0} |sin(k*Pi/3)|/2^k.
%F A373018 Equals (3/7)*sqrt(3).
%e A373018 0.7423074889580902686546198606453738715469165373...
%t A373018 s = Sum[Abs[Sin[k Pi/3]]/2^k, {k, 0, Infinity}]
%t A373018 d = N[s, 100]
%t A373018 First[RealDigits[d]]
%Y A373018 Cf. A373021.
%K A373018 nonn,cons
%O A373018 0,1
%A A373018 _Clark Kimberling_, Jul 16 2024