This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A189081 Zero-one sequence based on the sequence floor(n*sqrt(2)):  a(A001951(k))=a(k); a(A001952(k))=1-a(k); a(1)=0, a(2)=1. 5

%I

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

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

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

%N Zero-one sequence based on the sequence floor(n*sqrt(2)): a(A001951(k))=a(k); a(A001952(k))=1-a(k); a(1)=0, a(2)=1.

%e Let u=A001951=(Beatty sequence for sqrt(2)) and v=A001952=(Beatty sequence for 2+sqrt(2)). Then A189081 is the sequence a given by a(u(k))=a(k); a(v(k))=1-a(k), where a(0)=0 and a(1)=1.

%t r = 2^(1/2); u[n_] := Floor[r*n]; (*A001951*)

%t v[n_] := Floor[(2 + r) n]; (*A001952*)

%t a[1] = 0; a[2] = 1; h = 200;

%t c = Table[u[n], {n, 1, h}];

%t d = Table[v[n], {n, 1, h}];

%t Table[a[d[[n]]] = 1 - a[n], {n, 1, h - 1}]; (*A189081*)

%t Table[a[c[[n]]] = a[n], {n, 1, h}] (*A189081*)

%t Flatten[Position[%, 0]] (*A189082*)

%t Flatten[Position[%%, 1]] (*A189083*)

%Y Cf. A189078, A189082, A189083, A188967.

%K nonn

%O 1

%A _Clark Kimberling_, Apr 16 2011

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.