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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A199265 Decimal expansion of x<0 satisfying 2*x^2+x*cos(x)=2. 3
1, 1, 1, 5, 8, 6, 5, 4, 7, 4, 1, 7, 7, 8, 0, 0, 9, 2, 0, 0, 2, 5, 9, 0, 5, 3, 5, 2, 5, 3, 5, 8, 5, 5, 7, 9, 2, 7, 3, 6, 1, 2, 8, 0, 6, 6, 4, 8, 7, 3, 9, 7, 8, 1, 7, 4, 4, 6, 2, 5, 9, 3, 7, 6, 5, 1, 2, 5, 1, 1, 5, 6, 7, 6, 9, 2, 4, 1, 6, 1, 0, 9, 0, 2, 1, 6, 0, 9, 2, 7, 8, 4, 4, 7, 0, 8, 5, 6, 8 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,4

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: -1.11586547417780092002590535253585579273...

positive:  0.84824964906603356449300167136536010515870...

MATHEMATICA

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

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

Plot[{f[x], g[x]}, {x, -2, 2}, {AxesOrigin -> {0, 0}}]

r = x /. FindRoot[f[x] == g[x], {x, -1.2, -1.1}, WorkingPrecision -> 110]

RealDigits[r]   (* A199265 *)

r = x /. FindRoot[f[x] == g[x], {x, .84, .85}, WorkingPrecision -> 110]

RealDigits[r]   (* A199266 *)

CROSSREFS

Cf. A199170.

Sequence in context: A011495 A136258 A102519 * A239382 A085117 A301862

Adjacent sequences:  A199262 A199263 A199264 * A199266 A199267 A199268

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 December 5 16:11 EST 2019. Contains 329753 sequences. (Running on oeis4.)