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 A198430 #8 Apr 23 2025 12:28:51
%S A198430 2,6,7,4,0,9,8,0,8,7,0,5,0,6,8,0,8,5,1,5,5,3,6,3,9,3,8,9,9,9,2,3,0,5,
%T A198430 6,7,6,6,6,6,7,1,8,7,7,3,7,0,6,6,1,7,8,6,1,1,8,9,8,0,0,4,8,2,6,7,9,1,
%U A198430 0,9,2,4,8,8,1,6,1,5,6,5,2,8,8,4,4,1,9,3,6,8,6,8,2,5,6,9,8,2,8
%N A198430 Decimal expansion of x>0 having x^2-2x=4*sin(x).
%C A198430 See A198414 for a guide to related sequences. The Mathematica program includes a graph.
%H A198430 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A198430 2.674098087050680851553639389992305676666...
%t A198430 a = 1; b = -2; c = 4;
%t A198430 f[x_] := a*x^2 + b*x; g[x_] := c*Sin[x]
%t A198430 Plot[{f[x], g[x]}, {x, -.2, 3}]
%t A198430 r = x /. FindRoot[f[x] == g[x], {x, 2.67, 2.68}, WorkingPrecision -> 110]
%t A198430 RealDigits[r] (* A198430 *)
%Y A198430 Cf. A198414.
%K A198430 nonn,cons
%O A198430 1,1
%A A198430 _Clark Kimberling_, Oct 25 2011