A189132 Zero-one sequence based on the sequence (n^2+n-1): a(A028387(k))=a(k); a(A028392(k))=1-a(k), a(1)=0.

0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 1

Offset

1

Links

Table of n, a(n) for n=1..135.

Mathematica

r=n^2+n-1; u[n_] := Floor[n*r];  (*A028387*)
a[1] = 0; h = 128;
c = (u[#1] &) /@ Range[2h];
d = (Complement[Range[Max[#1]], #1] &)[c]; (*A028392*)
Table[a[d[[n]]] = 1 - a[n], {n, 1, h - 1}]; (*A189132*)
Table[a[c[[n]]] = a[n], {n, 1, h}]   (*A189132*)
Flatten[Position[%, 0]]  (*A189133*)
Flatten[Position[%%, 1]] (*A189134*)

Crossrefs

Cf. A188967, A189133, A189134, A028387, A028392.

Sequence in context: A189673 A189014 A189017 * A189203 A296028 A165263

Adjacent sequences: A189129 A189130 A189131 * A189133 A189134 A189135

Keyword

nonn

Author

Clark Kimberling, Apr 17 2011

Status

approved