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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A246306 Numbers k such that cos(k) > cos(k+1) < cos(k+2) < cos(k+3) > cos(k+4). 4
0, 6, 13, 19, 25, 32, 38, 44, 50, 57, 63, 69, 76, 82, 88, 94, 101, 107, 113, 120, 126, 132, 138, 145, 151, 157, 164, 170, 176, 182, 189, 195, 201, 207, 214, 220, 226, 233, 239, 245, 251, 258, 264, 270, 277, 283, 289, 295, 302, 308, 314, 321, 327, 333, 339 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The sequences A246303, A246304, A246305, A246306 partition the nonnegative integers.

LINKS

Clark Kimberling, Table of n, a(n) for n = 1..1000

MATHEMATICA

z = 500; f[x_] := f[x] = Cos[x]; t = Range[0, z];

Select[t, f[#] < f[# + 1] &]  (* A246303 *)

Select[t, f[#] > f[# + 1] < f[# + 2] &]  (* A246304 *)

Select[t, f[#] > f[# + 1] > f[# + 2] < f[# + 3] &]  (* A246305 *)

Select[t, f[#] > f[# + 1] > f[# + 2] > f[# + 3] < f[# + 4] &] (* A246306 *)

CROSSREFS

Cf. A026303, A246304, A246305, A026311 (complement of A246303).

Sequence in context: A095911 A013575 A075727 * A135274 A189378 A022388

Adjacent sequences:  A246303 A246304 A246305 * A246307 A246308 A246309

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Aug 22 2014

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 March 21 01:18 EDT 2019. Contains 321356 sequences. (Running on oeis4.)