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A126564 a(n) = floor( sin(n)*cos(n) ). 3

%I #11 Apr 06 2021 20:16:25

%S 0,0,-1,-1,0,-1,-1,0,-1,-1,0,-1,-1,0,0,-1,0,0,-1,0,0,-1,0,0,-1,-1,0,

%T -1,-1,0,-1,-1,0,-1,-1,0,0,-1,0,0,-1,0,0,-1,0,0,-1,-1,0,-1,-1,0,-1,-1,

%U 0,-1,-1,0,0,-1,0,0,-1,0,0,-1,0,0,-1,-1,0,-1,-1,0,-1,-1,0,-1,-1,0,0,-1,0,0,-1,0,0,-1,0,0,-1,-1,0,-1,-1,0,-1,-1,0,-1,-1,0,0

%N a(n) = floor( sin(n)*cos(n) ).

%F a(n) = floor(sin(n)*cos(n)).

%F a(n) = floor(sin(2n)/2). [_Wesley Ivan Hurt_, Jun 22 2013]

%o (PARI) a(n) = floor(sin(n)*cos(n))

%Y Cf. A000480, A000493, A126565.

%K sign

%O 0,1

%A _Rick L. Shepherd_, Dec 27 2006

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Last modified April 24 22:17 EDT 2024. Contains 371964 sequences. (Running on oeis4.)