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A246441 Nonnegative integers k satisfying cos(k) < sec(k+1). 2
0, 4, 5, 6, 10, 11, 12, 13, 17, 18, 19, 23, 24, 25, 29, 30, 31, 36, 37, 38, 42, 43, 44, 48, 49, 50, 54, 55, 56, 57, 61, 62, 63, 67, 68, 69, 73, 74, 75, 80, 81, 82, 86, 87, 88, 92, 93, 94, 98, 99, 100, 101, 105, 106, 107, 111, 112, 113, 117, 118, 119, 124 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

k is taken in radians.

Also, the nonnegative integers k satisfying sin(k) < sec(k+1).

LINKS

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

MATHEMATICA

z = 200;

Select[Range[0, z], Cos[#] > Sec[# + 1] &] (* A246440 *)

Select[Range[0, z], Cos[#] < Sec[# + 1] &] (* A246441 *)

PROG

(PARI) select(n -> cos(n)<1/cos(n+1), [0..200]) \\ Edward Jiang, Sep 01 2014

CROSSREFS

Cf. A246440.

Sequence in context: A028280 A120520 A213523 * A026312 A070751 A047258

Adjacent sequences:  A246438 A246439 A246440 * A246442 A246443 A246444

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Aug 26 2014

STATUS

approved

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Last modified October 18 23:39 EDT 2019. Contains 328211 sequences. (Running on oeis4.)