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%I #5 Sep 01 2014 18:53:08
%S 1,2,3,4,5,6,7,8,9,10,11,12,14,15,17,18,20,21,23,24,25,26,27,28,29,30,
%T 31,32,33,34,36,37,39,40,42,43,45,46,47,48,49,50,51,52,53,54,55,56,58,
%U 59,61,62,64,65,67,68,69,70,71,72,73,74,75,76,77,78,80
%N Nonnegative integers k satisfying sin(k)*cos(k+1) < 0.
%H Clark Kimberling, <a href="/A246450/b246450.txt">Table of n, a(n) for n = 1..1000</a>
%t z = 200;
%t Select[Range[0, z], Sin[#] Cos[# + 1] < 0 &] (* A246450 *)
%t Select[Range[0, z], Sin[#] Cos[# + 1] > 0 &] (* A246451 *)
%Y Cf. A246451 (complement of A246450), A246442.
%K nonn,easy
%O 1,2
%A _Clark Kimberling_, Aug 26 2014
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