A189011 Zero-one sequence based on triangular numbers: a(A000217(k))=a(k); a(A014132(k))=1-a(k); a(1)=0.

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

Offset

1

Links

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

Example

Let u=A000217 and v=A014132, so that u(n)=n(n+1)/2 and v=complement(u) for n>=1.  Then a is a self-generating zero-one sequence with initial value a(1)=0 and a(u(k))=a(k); a(v(k))=1-a(k).

Mathematica

u[n_] := n(n+1)/2;  (*A000217*)
a[1] = 0; h = 128;
c = (u[#1] &) /@ Range[h];
d = (Complement[Range[Max[#1]], #1] &)[c]; (*A014132*)
Table[a[d[[n]]] = 1 - a[n], {n, 1, h - 1}];
Table[a[c[[n]]] = a[n], {n, 1, h}]   (*A189011*)
Flatten[Position[%, 0]]  (*A189012*)
Flatten[Position[%%, 1]] (*A189013*)

Crossrefs

Cf. A188967, A189012, A189013, A188973.

Sequence in context: A234046 A285565 A188076 * A189135 A369961 A219189

Adjacent sequences: A189008 A189009 A189010 * A189012 A189013 A189014

Keyword

nonn

Author

Clark Kimberling, Apr 15 2011

Status

approved