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A246442 Nonnegative integers k satisfying cos(k)*sin(k+1) < 0. 3
2, 5, 8, 11, 24, 27, 30, 33, 46, 49, 52, 55, 68, 71, 74, 77, 90, 93, 96, 99, 112, 115, 118, 121, 134, 137, 140, 143, 156, 159, 162, 165, 178, 181, 184, 187, 200, 203, 206, 209, 222, 225, 228, 231, 244, 247, 250, 253, 266, 269, 272, 275, 288, 291, 294, 297 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

MATHEMATICA

z = 420;

Select[Range[0, z], Cos[#] Sin[# + 1] < 0 &]  (* A246442 *)

Select[Range[0, z], Cos[#] Sin[# + 1] > 0 &]  (* A246443 *)

CROSSREFS

Cf. A246443 (complement of A246442), A246450.

Sequence in context: A261578 A264613 A285293 * A056661 A229883 A135050

Adjacent sequences:  A246439 A246440 A246441 * A246443 A246444 A246445

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Aug 26 2014

STATUS

approved

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Last modified June 20 17:51 EDT 2019. Contains 324234 sequences. (Running on oeis4.)