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A276793 Indicator function for A003144. 7
0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0

COMMENTS

a(n) = 1 iff n is a member of A003144.

a(n+1) = 1 iff n is a member of A278041, for n >= 0. - Wolfdieter Lang, Dec 06 2018

LINKS

N. J. A. Sloane, Table of n, a(n) for n = 0..10000

Wolfdieter Lang, The Tribonacci and ABC Representations of Numbers are Equivalent, arXiv preprint arXiv:1810.09787 [math.NT], 2018.

FORMULA

a(n+1) = (t(n) - 1)*(t(n) - 2)/2, for n >= 0, and a(0) = 0, where t(n) = A080843(n).  - Wolfdieter Lang, Dec 06 2018

CROSSREFS

Cf. A003144, A080843, A276796, A278041.

A276793(n)+A276794(n)+A276791(n)=1; A276796(n)+A276797(n)+A276798(n)=n+1.

Sequence in context: A113217 A189219 A189008 * A285515 A190204 A189028

Adjacent sequences:  A276790 A276791 A276792 * A276794 A276795 A276796

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Oct 28 2016

STATUS

approved

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Last modified August 25 05:19 EDT 2019. Contains 326318 sequences. (Running on oeis4.)