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 A199448 #8 Feb 08 2025 09:19:57
%S A199448 7,4,9,5,2,8,8,3,2,5,0,9,1,1,5,4,7,8,6,4,9,5,3,7,8,3,1,0,3,3,4,6,3,1,
%T A199448 7,1,3,6,5,2,4,9,8,5,0,3,1,1,3,0,4,2,5,7,6,8,4,2,6,4,2,7,0,0,4,6,5,2,
%U A199448 3,5,5,0,0,5,3,2,7,0,3,9,9,2,0,8,6,6,1,6,5,7,0,7,0,3,7,6,8,8,1
%N A199448 Decimal expansion of x>0 satisfying 3*x^2+x*sin(x)=3*cos(x).
%C A199448 See A199370 for a guide to related sequences. The Mathematica program includes a graph.
%H A199448 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A199448 0.74952883250911547864953783103346317136524985031130...
%t A199448 a = 3; b = 1; c = 3;
%t A199448 f[x_] := a*x^2 + b*x*Sin[x]; g[x_] := c*Cos[x]
%t A199448 Plot[{f[x], g[x]}, {x, -Pi, Pi}, {AxesOrigin -> {0, 0}}]
%t A199448 r = x /. FindRoot[f[x] == g[x], {x, .74, .75}, WorkingPrecision -> 110]
%t A199448 RealDigits[r] (* A199448 *)
%Y A199448 Cf. A199429.
%K A199448 nonn,cons
%O A199448 0,1
%A A199448 _Clark Kimberling_, Nov 06 2011