A198843 Decimal expansion of x>0 satisfying x^2-4*cos(x)=-2.

8, 3, 2, 2, 9, 6, 4, 6, 2, 4, 2, 0, 4, 5, 4, 8, 1, 5, 8, 3, 2, 6, 8, 9, 6, 3, 9, 1, 5, 4, 8, 3, 8, 2, 7, 3, 9, 2, 3, 2, 7, 3, 3, 4, 7, 5, 9, 0, 9, 2, 0, 9, 5, 3, 8, 4, 6, 3, 3, 1, 8, 2, 9, 9, 0, 7, 2, 2, 1, 4, 3, 1, 4, 2, 2, 9, 9, 5, 9, 5, 8, 8, 0, 4, 2, 3, 4, 0, 0, 9, 8, 4, 3, 7, 6, 4, 4, 3, 4

Offset: 0

Author

Clark Kimberling, Oct 30 2011

Keywords

• nonn
• cons

Comments

See A198755 for a guide to related sequences. The Mathematica program includes a graph.

Examples

			0.832296462420454815832689639154838273923273...
		

Links

• Index entries for transcendental numbers.

Crossrefs

Cf. A198755.

Programs

Mathematica

a = 1; b = -4; c = -2;
f[x_] := a*x^2 + b*Cos[x]; g[x_] := c
Plot[{f[x], g[x]}, {x, -3, 3}, {AxesOrigin -> {0, 0}}]
r = x /. FindRoot[f[x] == g[x], {x, .83, .84}, WorkingPrecision -> 110]
RealDigits[r] (* A198843 *)