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A246443
Nonnegative integers k satisfying cos(k)*sin(k+1) > 0.
4
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
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: A130269 A290730 A369856 * A186495 A184746 A186227
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Aug 26 2014
STATUS
approved