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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A198824 Decimal expansion of x>0 satisfying x^2-2*cos(x)=4. 2
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, 1, 6, 7, 5, 1, 7, 6 (list; constant; graph; refs; listen; history; text; internal format)
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=1.854678247914931494756755132033065068261401688...

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 *)

CROSSREFS

Cf. A198755.

Sequence in context: A010525 A190184 A275984 * A021121 A199956 A254270

Adjacent sequences:  A198821 A198822 A198823 * A198825 A198826 A198827

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 September 21 19:59 EDT 2019. Contains 327282 sequences. (Running on oeis4.)