A198824 Decimal expansion of x>0 satisfying x^2-2*cos(x)=4.

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

Offset: 1

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

			1.854678247914931494756755132033065068261401688...
		

Links

• Index entries for transcendental numbers.

Crossrefs

Cf. A198755.

Programs

Mathematica

a = 1; b = -2; c = 4;
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, 1.8, 1.9}, WorkingPrecision -> 110]
RealDigits[r]  (* A198824 *)