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 A197730 #10 Oct 01 2022 00:54:38
%S A197730 1,3,1,9,7,0,2,5,3,9,4,6,5,3,2,7,8,7,2,2,6,8,5,6,4,1,2,3,5,4,1,1,4,0,
%T A197730 1,5,1,3,9,7,5,6,2,3,2,9,7,1,3,0,6,7,7,2,3,7,9,7,8,4,9,6,0,4,3,7,7,5,
%U A197730 2,0,6,3,9,2,5,1,7,0,9,2,9,3,0,6,0,5,5,1,3,7,3,8,1,0,7,7,9,0,0
%N A197730 Decimal expansion of 3*Pi/(4+Pi).
%C A197730 Least x>0 such that sin(bx)=cos(cx) (and also sin(cx)=cos(bx)), where b=2/3 and c=Pi/6; see the Mathematica program for a graph and A197682 for a discussion and guide to related sequences.
%H A197730 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>
%e A197730 1.3197025394653278722685641235411401513975623...
%t A197730 b = 2/3; c = Pi/6;
%t A197730 t = x /. FindRoot[Sin[b*x] == Cos[c*x], {x, 1.131, 1.132}]
%t A197730 N[Pi/(2*b + 2*c), 110]
%t A197730 RealDigits[%] (* A197730 *)
%t A197730 Simplify[Pi/(2*b + 2*c)]
%t A197730 Plot[{Sin[b*x], Cos[c*x]}, {x, 0, Pi/2}]
%Y A197730 Cf. A197682.
%K A197730 nonn,cons
%O A197730 1,2
%A A197730 _Clark Kimberling_, Oct 17 2011