A135133 - OEIS

A135133

a(n) = floor(S2(n)/3) mod 2, where S2(n) denotes the binary weight of n.

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

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OFFSET

0,1

COMMENTS

A generalized Thue-Morse sequence.

LINKS

Nathaniel Johnston, Table of n, a(n) for n = 0..10000

Ricardo Astudillo, On a class of Thue-Morse type sequences, Journal of Integer Sequences, Vol. 6 (2003), Article 03.4.2.

MAPLE

S2 := proc(n) return add(d, d=convert(n, base, 2)): end: A135133 := proc(n) return floor(S2(n)/3) mod 2: end: seq(A135133(n), n=0..104); # Nathaniel Johnston, May 06 2011

MATHEMATICA

Table[Mod[Floor[(Plus @@ IntegerDigits[n, 2])/3], 2], {n, 0, 50}] (* G. C. Greubel, Sep 28 2016 *)

CROSSREFS

Cf. A000120, A010060.

Sequence in context: A358753 A175854 A353678 * A011712 A011715 A011721

Adjacent sequences: A135130 A135131 A135132 * A135134 A135135 A135136

KEYWORD

nonn,base,easy

AUTHOR

Ctibor O. Zizka, Feb 12 2008

STATUS

approved