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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A197839 Decimal expansion of least x having x^2-4x=-cos(x). 3
2, 5, 8, 3, 9, 2, 1, 4, 4, 3, 7, 1, 5, 9, 9, 6, 7, 4, 0, 2, 7, 5, 7, 4, 2, 3, 8, 0, 7, 3, 8, 6, 0, 2, 7, 5, 2, 6, 1, 0, 1, 6, 7, 1, 1, 3, 5, 5, 3, 3, 3, 7, 1, 4, 8, 5, 1, 6, 5, 7, 1, 4, 3, 0, 0, 8, 6, 6, 0, 7, 0, 4, 4, 6, 0, 0, 0, 8, 7, 7, 8, 1, 4, 7, 0, 5, 5, 3, 8, 8, 8, 7, 4, 3, 7, 8, 8, 4, 2 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

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

LINKS

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

EXAMPLE

least x: 0.25839214437159967402757423807386027526101...

greatest x: 4.13257347075386830819844170536280612105...

MATHEMATICA

a = 1; b = -4; c = -1;

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

Plot[{f[x], g[x]}, {x, -1, 5}]

r1 = x /. FindRoot[f[x] == g[x], {x, -4.2, -4.1}, WorkingPrecision -> 110]

RealDigits[r1] (* A197839 *)

r2 = x /. FindRoot[f[x] == g[x], {x, 4.1, 4.2}, WorkingPrecision -> 110]

RealDigits[r2] (* A197840 *)

CROSSREFS

Cf. A197737.

Sequence in context: A200225 A258749 A056886 * A021391 A162611 A152248

Adjacent sequences:  A197836 A197837 A197838 * A197840 A197841 A197842

KEYWORD

nonn,cons

AUTHOR

Clark Kimberling, Oct 20 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 November 17 16:08 EST 2019. Contains 329241 sequences. (Running on oeis4.)