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 A198544 #8 Apr 23 2025 12:37:44
%S A198544 7,7,4,2,3,8,8,9,1,7,5,6,3,9,1,3,2,0,4,2,7,4,0,3,6,1,9,7,3,8,5,0,9,3,
%T A198544 9,9,3,2,0,8,8,6,1,1,0,9,8,1,0,8,1,4,8,9,0,6,8,0,1,2,5,5,7,6,9,8,7,1,
%U A198544 4,3,7,7,8,1,0,5,7,8,5,6,8,6,1,0,1,0,1,1,6,4,2,2,6,5,1,8,6,6,9
%N A198544 Decimal expansion of x<0 having 4*x^2+4x=sin(x).
%C A198544 See A198414 for a guide to related sequences. The Mathematica program includes a graph.
%H A198544 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A198544 -0.77423889175639132042740361973850...
%t A198544 a = 4; b = 4; c = 1;
%t A198544 f[x_] := a*x^2 + b*x; g[x_] := c*Sin[x]
%t A198544 Plot[{f[x], g[x]}, {x, -1, .42}]
%t A198544 r = x /. FindRoot[f[x] == g[x], {x, -.8, -.7}, WorkingPrecision -> 110]
%t A198544 RealDigits[r] (* A198544 *)
%Y A198544 Cf. A198414.
%K A198544 nonn,cons
%O A198544 0,1
%A A198544 _Clark Kimberling_, Oct 26 2011