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 A199956 #12 Feb 08 2025 23:04:00
%S A199956 1,8,5,4,7,7,8,4,1,0,3,5,6,7,5,1,7,7,4,1,4,1,9,3,9,5,8,1,7,3,6,9,9,8,
%T A199956 7,6,1,2,0,4,0,2,7,3,4,6,6,2,5,0,8,3,5,1,5,6,1,8,5,4,3,4,9,8,5,1,4,3,
%U A199956 3,5,0,3,4,7,8,0,5,7,7,0,2,7,3,9,6,7,0,0,4,1,6,7,4,8,0,9,8,5,4
%N A199956 Decimal expansion of greatest x satisfying x^2 + 2*cos(x) = 3*sin(x).
%C A199956 See A199949 for a guide to related sequences. The Mathematica program includes a graph.
%H A199956 G. C. Greubel, <a href="/A199956/b199956.txt">Table of n, a(n) for n = 1..10000</a>
%H A199956 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A199956 least x: 0.74080336819413223759642692454702162091742...
%e A199956 greatest x: 1.854778410356751774141939581736998761204...
%t A199956 a = 1; b = 2; c = 3;
%t A199956 f[x_] := a*x^2 + b*Cos[x]; g[x_] := c*Sin[x]
%t A199956 Plot[{f[x], g[x]}, {x, -1, 3}, {AxesOrigin -> {0, 0}}]
%t A199956 r = x /. FindRoot[f[x] == g[x], {x, .74, .75}, WorkingPrecision -> 110]
%t A199956 RealDigits[r] (* A199955 *)
%t A199956 r = x /. FindRoot[f[x] == g[x], {x, 1.8, 1.9}, WorkingPrecision -> 110]
%t A199956 RealDigits[r] (* A199956 *)
%o A199956 (PARI) a=1; b=2; c=3; solve(x=.5, 1, a*x^2 + b*cos(x) - c*sin(x)) \\ _G. C. Greubel_, Jun 22 2018
%Y A199956 Cf. A199949.
%K A199956 nonn,cons
%O A199956 1,2
%A A199956 _Clark Kimberling_, Nov 12 2011