A280737 a(n) = A007302(n) - 1.

0, 0, 1, 0, 1, 1, 1, 0, 1, 1, 2, 1, 2, 1, 1, 0, 1, 1, 2, 1, 2, 2, 2, 1, 2, 2, 2, 1, 2, 1, 1, 0, 1, 1, 2, 1, 2, 2, 2, 1, 2, 2, 3, 2, 3, 2, 2, 1, 2, 2, 3, 2, 3, 2, 2, 1, 2, 2, 2, 1, 2, 1, 1, 0, 1, 1, 2, 1, 2, 2, 2, 1, 2, 2, 3, 2, 3, 2, 2, 1, 2, 2, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 3, 2, 2, 1, 2, 2, 3

Offset

1,11

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..10000

Alma D'Aniello, Aldo de Luca, and Alessandro De Luca, On Christoffel and standard words and their derivatives, arXiv:1602.03231 [cs.DM], 2016 (mentions this sequence).

Prog

(PARI) a(n)=hammingweight(bitxor(n, 3*n))-1; \\ Joerg Arndt, Feb 25 2023

Crossrefs

Cf. A007302.

Sequence in context: A116510 A128915 A063995 * A322305 A020951 A117118

Adjacent sequences: A280734 A280735 A280736 * A280738 A280739 A280740

Keyword

nonn

Author

N. J. A. Sloane, Jan 11 2017

Status

approved