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 A198837 #8 Feb 07 2025 16:44:05
%S A198837 1,3,8,0,3,4,3,5,1,9,9,5,5,4,3,1,1,4,4,2,0,6,9,4,9,1,5,7,5,5,6,8,8,1,
%T A198837 5,5,7,1,5,5,6,4,6,4,6,9,7,8,5,3,6,8,3,2,8,5,5,3,7,1,2,9,3,9,9,6,5,2,
%U A198837 9,7,9,7,3,9,9,1,0,4,3,4,5,9,1,3,8,5,1,7,4,0,7,2,4,5,9,2,4,8,0
%N A198837 Decimal expansion of x>0 satisfying 2*x^2+cos(x)=4.
%C A198837 See A198755 for a guide to related sequences. The Mathematica program includes a graph.
%H A198837 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A198837 1.3803435199554311442069491575568815571556...
%t A198837 a = 2; b = 1; c = 4;
%t A198837 f[x_] := a*x^2 + b*Cos[x]; g[x_] := c
%t A198837 Plot[{f[x], g[x]}, {x, -2, 2}, {AxesOrigin -> {0, 0}}]
%t A198837 r = x /. FindRoot[f[x] == g[x], {x, 1.3, 1.4}, WorkingPrecision -> 110]
%t A198837 RealDigits[r] (* A198837 *)
%Y A198837 Cf. A198755.
%K A198837 nonn,cons
%O A198837 1,2
%A A198837 _Clark Kimberling_, Oct 31 2011