A198757 Decimal expansion of x>0 satisfying x^2+cos(x)=4.

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

Offset

1,1

Comments

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

Links

Table of n, a(n) for n=1..99.

Example

x=2.128126465684922487652468794983799168780928...

Mathematica

a = 1; b = 1; 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, 2.1, 2.2}, WorkingPrecision -> 110]
RealDigits[r]   (* A198757 *)

Crossrefs

Cf. A198755.

Sequence in context: A114303 A030651 A179946 * A173755 A140894 A208747

Adjacent sequences: A198754 A198755 A198756 * A198758 A198759 A198760

Keyword

nonn,cons

Author

Clark Kimberling, Oct 30 2011

Status

approved