A246443 Nonnegative integers k satisfying cos(k)*sin(k+1) > 0.

0, 1, 3, 4, 6, 7, 9, 10, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 25, 26, 28, 29, 31, 32, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 47, 48, 50, 51, 53, 54, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 69, 70, 72, 73, 75, 76, 78, 79, 80, 81

Offset

1,3

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. A246442 (complement of A246442), A246451.

Sequence in context: A357504 A130269 A290730 * A186495 A184746 A186227

Adjacent sequences: A246440 A246441 A246442 * A246444 A246445 A246446

Keyword

nonn,easy

Author

Clark Kimberling, Aug 26 2014

Status

approved