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 A198421 #8 Apr 23 2025 12:17:17
%S A198421 1,9,5,1,4,8,7,5,3,4,0,9,5,6,6,9,7,7,6,5,4,7,0,7,3,8,5,1,8,7,7,5,5,4,
%T A198421 9,1,8,5,1,6,9,3,7,9,3,3,0,4,4,3,5,5,4,6,7,3,2,4,7,1,8,3,4,2,8,0,3,8,
%U A198421 6,4,2,7,1,9,2,2,5,1,5,2,2,5,7,3,2,2,0,9,9,7,9,1,2,9,5,7,3,3,5
%N A198421 Decimal expansion of x>0 having x^2-x=2*sin(x).
%C A198421 See A198414 for a guide to related sequences. The Mathematica program includes a graph.
%H A198421 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A198421 1.9514875340956697765470738518775549185...
%t A198421 a = 1; b = -1; c = 2;
%t A198421 f[x_] := a*x^2 + b*x; g[x_] := c*Sin[x]
%t A198421 Plot[{f[x], g[x]}, {x, -1, 2}]
%t A198421 r = x /. FindRoot[f[x] == g[x], {x, 1.9, 2.0}, WorkingPrecision -> 110]
%t A198421 RealDigits[r] (* A198421 *)
%Y A198421 Cf. A198414.
%K A198421 nonn,cons
%O A198421 1,2
%A A198421 _Clark Kimberling_, Oct 24 2011