login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A199275 Decimal expansion of x<0 satisfying 2*x^2+3*x*cos(x)=2. 3
1, 2, 5, 7, 5, 0, 7, 4, 8, 2, 6, 9, 6, 7, 9, 7, 8, 1, 2, 6, 2, 4, 5, 2, 2, 8, 2, 0, 0, 6, 8, 6, 6, 9, 2, 1, 0, 2, 2, 7, 8, 5, 6, 0, 1, 9, 8, 0, 6, 8, 6, 4, 9, 7, 2, 4, 3, 9, 0, 1, 1, 4, 7, 9, 5, 7, 1, 4, 7, 4, 6, 4, 0, 9, 9, 8, 8, 2, 2, 6, 4, 4, 7, 6, 8, 9, 8, 5, 8, 2, 2, 3, 6, 0, 9, 1, 9, 9, 1 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

See A199170 for a guide to related sequences.  The Mathematica program includes a graph.

LINKS

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

EXAMPLE

negative: -1.25750748269679781262452282006866921022...

positive:  0.547005740546889576436923247150755725087...

MATHEMATICA

a = 2; b = 3; c = 2;

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

Plot[{f[x], g[x]}, {x, -3, 3}, {AxesOrigin -> {0, 0}}]

r = x /. FindRoot[f[x] == g[x], {x, -1.3, -1.2}, WorkingPrecision -> 110]

RealDigits[r]    (* A199275 *)

r = x /. FindRoot[f[x] == g[x], {x, .54, .55}, WorkingPrecision -> 110]

RealDigits[r]    (* A199276 *)

CROSSREFS

Cf. A199170.

Sequence in context: A205113 A098486 A138320 * A135007 A082880 A257321

Adjacent sequences:  A199272 A199273 A199274 * A199276 A199277 A199278

KEYWORD

nonn,cons

AUTHOR

Clark Kimberling, Nov 04 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 January 22 10:52 EST 2020. Contains 331144 sequences. (Running on oeis4.)