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 A198542 #8 Apr 23 2025 12:37:31
%S A198542 2,5,5,4,1,8,8,5,9,9,3,7,6,0,8,1,0,1,0,0,7,6,2,2,8,1,0,9,4,9,1,6,4,2,
%T A198542 4,3,4,9,4,9,9,6,1,1,9,0,9,1,4,9,8,4,8,7,1,4,1,5,3,5,8,0,4,3,3,0,5,9,
%U A198542 4,3,7,1,7,6,8,9,0,9,8,1,9,3,1,6,6,8,2,1,6,8,7,2,5,7,9,8,3,9,8
%N A198542 Decimal expansion of x<0 having 4*x^2+3x=2*sin(x).
%C A198542 See A198414 for a guide to related sequences. The Mathematica program includes a graph.
%H A198542 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A198542 -0.2554188599376081010076228109491642434...
%t A198542 a = 4; b = 3; c = 2;
%t A198542 f[x_] := a*x^2 + b*x; g[x_] := c*Sin[x]
%t A198542 Plot[{f[x], g[x]}, {x, -.5, .2}]
%t A198542 r = x /. FindRoot[f[x] == g[x], {x, -.26, -.25}, WorkingPrecision -> 110]
%t A198542 RealDigits[r] (* A198542 *)
%Y A198542 Cf. A198414.
%K A198542 nonn,cons
%O A198542 0,1
%A A198542 _Clark Kimberling_, Oct 26 2011