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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A197849 Decimal expansion of least x having x^2-2x=-2*cos(x). 3
1, 0, 4, 8, 5, 5, 8, 3, 5, 9, 4, 9, 0, 4, 9, 4, 0, 9, 5, 7, 5, 8, 5, 6, 5, 2, 6, 4, 0, 4, 5, 4, 9, 3, 1, 9, 3, 1, 5, 3, 0, 9, 0, 2, 5, 3, 2, 8, 2, 2, 4, 6, 8, 1, 8, 8, 4, 3, 1, 1, 0, 2, 4, 1, 5, 1, 3, 5, 8, 8, 9, 5, 6, 0, 0, 5, 9, 0, 8, 9, 1, 7, 5, 2, 4, 4, 2, 1, 8, 2, 9, 9, 7, 0, 9, 5, 4, 0, 1 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

See A197737 for a guide to related sequences.  The Mathematica program includes a graph.

LINKS

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

EXAMPLE

least x: 1.048558359490494095758565264045...

greatest x: 2.667028464105801792635542129...

MATHEMATICA

a = 1; b = -2; c = -2;

f[x_] := a*x^2 + b*x; g[x_] := c*Cos[x]

Plot[{f[x], g[x]}, {x, 0, 3}]

r1 = x /. FindRoot[f[x] == g[x], {x, 1, 1.1}, WorkingPrecision -> 110]

RealDigits[r1] (* A197849 *)

r2 = x /. FindRoot[f[x] == g[x], {x, 2.6, 2.7}, WorkingPrecision -> 110]

RealDigits[r2] (* A197850 *)

CROSSREFS

Cf. A197737.

Sequence in context: A154912 A133921 A021210 * A292466 A246856 A113969

Adjacent sequences:  A197846 A197847 A197848 * A197850 A197851 A197852

KEYWORD

nonn,cons

AUTHOR

Clark Kimberling, Oct 21 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 June 24 04:38 EDT 2019. Contains 324318 sequences. (Running on oeis4.)