A276794 Indicator function for A003145.

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

Offset

0

Comments

a(n) = 1 iff n is a member of A003145.

a(n+1) = 1 iff n is a member of A278040, 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.

Index entries for characteristic functions

Formula

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

Crossrefs

Cf. A003145, A080843, A276797, A278040.

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

Sequence in context: A288173 A221150 A288997 * A289025 A289112 A289165

Adjacent sequences: A276791 A276792 A276793 * A276795 A276796 A276797

Keyword

nonn,easy

Author

N. J. A. Sloane, Oct 28 2016

Status

approved