A198874 Decimal expansion of x>0 satisfying 2*x^2-cos(x)=4.

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

Offset

1,2

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=1.437513268413420304257234147095927537423880...

Mathematica

a = 2; b = -1; c = 4;
f[x_] := a*x^2 + b*Cos[x]; g[x_] := c
Plot[{f[x], g[x]}, {x, -2, 2}, {AxesOrigin -> {0, 0}}]
r = x /. FindRoot[f[x] == g[x], {x, 1.4, 1.5}, WorkingPrecision -> 110]
RealDigits[r] (* A198874 *)

Crossrefs

Cf. A198755.

Sequence in context: A340012 A046548 A127752 * A276760 A365214 A257876

Adjacent sequences: A198871 A198872 A198873 * A198875 A198876 A198877

Keyword

nonn,cons

Author

Clark Kimberling, Oct 31 2011

Status

approved