A190226 - OEIS

%I #12 Dec 28 2017 03:41:23

%S 1,3,9,11,15,17,23,25,31,33,39,41,45,47,53,55,61,63,69,75,77,83,85,91,

%T 93,99,105,107,113,115,121,123,127,129,135,137,143,145,151,153,157,

%U 159,165,167,173,175,181,187,189,195,197,203,205,209,211,217,219,225,227,233,235,239,241,247,249,255,257,263,269,271,277,279,285

%N Positions of 1 in A190224; complement of A190225.

%H G. C. Greubel, <a href="/A190226/b190226.txt">Table of n, a(n) for n = 1..2750</a>

%t u = Sin[Pi/3]; v = Cos[Pi/3];

%t f[n_] := Floor[n*u + n*v] - Floor[n*u] - Floor[n*v]

%t t = Table[f[n], {n, 1, 120}] (* A190224 *)

%t Flatten[Position[t, 0]]      (* A190225 *)

%t Flatten[Position[t, 1]]      (* A190226 *)

%o (PARI) is(n) = my(u = sin(Pi/3), v = cos(Pi/3)); floor(n*u + n*v) - floor(n*u) - floor(n*v) \\ _Iain Fox_, Dec 27 2017

%Y Cf. A190224, A190225.

%K nonn

%O 1,2

%A _Clark Kimberling_, May 06 2011