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 A198490 #8 Apr 23 2025 12:35:51
%S A198490 3,7,0,9,8,6,6,6,1,0,0,6,7,4,9,7,1,9,4,1,9,4,4,7,5,1,0,1,4,5,7,3,2,6,
%T A198490 6,6,7,5,3,5,9,3,4,5,0,0,7,3,8,4,9,0,0,3,6,1,7,3,8,0,4,5,2,9,5,0,7,2,
%U A198490 9,5,9,4,0,4,7,2,4,1,2,2,8,0,1,9,6,5,0,2,9,8,9,5,7,0,9,2,3,8,3
%N A198490 Decimal expansion of x>0 having x^2-4x=2*sin(x).
%C A198490 See A198414 for a guide to related sequences. The Mathematica program includes a graph.
%H A198490 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A198490 3.70986661006749719419447510145732666...
%t A198490 a = 1; b = -4; c = 2;
%t A198490 f[x_] := a*x^2 + b*x; g[x_] := c*Sin[x]
%t A198490 Plot[{f[x], g[x]}, {x, -.2, 4}]
%t A198490 r = x /. FindRoot[f[x] == g[x], {x, 3.7, 3.71}, WorkingPrecision -> 110]
%t A198490 RealDigits[r] (* A198490 *)
%Y A198490 Cf. A198414.
%K A198490 nonn,cons
%O A198490 1,1
%A A198490 _Clark Kimberling_, Oct 25 2011