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 A198611 #13 Apr 23 2025 12:49:30
%S A198611 1,7,1,0,5,4,5,2,1,0,9,1,8,0,8,4,4,0,1,8,7,3,4,0,3,7,7,3,0,1,4,4,0,3,
%T A198611 1,9,7,6,5,7,9,5,1,0,1,0,5,0,4,5,2,6,8,1,7,6,5,8,6,3,2,4,4,8,0,1,2,8,
%U A198611 3,7,4,7,8,9,5,6,4,1,0,7,6,4,1,2,8,3,7,7,0,8,7,0,5,7,3,7,8,9,6
%N A198611 Decimal expansion of -x, where x < 0 satisfies 2*x^2+4*x = sin(x).
%C A198611 See A198414 for a guide to related sequences. The Mathematica program includes a graph.
%H A198611 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A198611 -1.71054521091808440187340377301440319765795101...
%t A198611 a = 2; b = 4; c = 1;
%t A198611 f[x_] := a*x^2 + b*x; g[x_] := c*Sin[x]
%t A198611 Plot[{f[x], g[x]}, {x, -2, 1}]
%t A198611 r = x /. FindRoot[f[x] == g[x], {x, -1.72, -1.71}, WorkingPrecision -> 110]
%t A198611 RealDigits[r] (* A198611 *)
%Y A198611 Cf. A198414.
%K A198611 nonn,cons
%O A198611 1,2
%A A198611 _Clark Kimberling_, Oct 27 2011
%E A198611 a(83) onwards corrected by _Georg Fischer_, Aug 01 2021