login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A198843 Decimal expansion of x>0 satisfying x^2-4*cos(x)=-2. 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 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

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

LINKS

Table of n, a(n) for n=0..98.

EXAMPLE

x=0.832296462420454815832689639154838273923273...

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 *)

CROSSREFS

Cf. A198755.

Sequence in context: A104842 A198344 A226042 * A119277 A273556 A154014

Adjacent sequences:  A198840 A198841 A198842 * A198844 A198845 A198846

KEYWORD

nonn,cons

AUTHOR

Clark Kimberling, Oct 30 2011

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 15 07:46 EDT 2019. Contains 328026 sequences. (Running on oeis4.)