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A189219 Zero-one sequence based on the octagonal numbers:  a(A000567(k))=a(k); a(A183220(k))=1-a(k), a(1)=0. 3
0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1

LINKS

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

MATHEMATICA

u[n_] := n(3n-2);  (*A000567*)

a[1] = 0; h = 128;

c = (u[#1] &) /@ Range[2h];

d = (Complement[Range[Max[#1]], #1] &)[c]; (*A183220*)

Table[a[d[[n]]] = 1 - a[n], {n, 1, h - 1}]; (*A189219*)

Table[a[c[[n]]] = a[n], {n, 1, h}]   (*A189219*)

Flatten[Position[%, 0]]  (*A189220*)

Flatten[Position[%%, 1]] (*A189221*)

CROSSREFS

Cf. A188967, A189220, A189221.

Sequence in context: A285589 A179081 A113217 * A189008 A285515 A190204

Adjacent sequences:  A189216 A189217 A189218 * A189220 A189221 A189222

KEYWORD

nonn

AUTHOR

Clark Kimberling, Apr 18 2011

STATUS

approved

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Last modified October 21 22:47 EDT 2019. Contains 328315 sequences. (Running on oeis4.)