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A026498 a(n) = t(1+3n), where t = A001285 (Thue-Morse sequence). 4
2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 1, 2, 1, 1, 1, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 1, 2, 1, 1, 1, 2, 2, 2, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 1, 2, 1, 1, 1, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Michael De Vlieger, Table of n, a(n) for n = 0..10000

MATHEMATICA

Array[1 + Mod[DigitCount[3 # + 1, 2, 1], 2] &, 105, 0] (* Michael De Vlieger, Oct 03 2019 *)

PROG

(PARI) a(n)=1+hammingweight(3*n+1)%2 \\ Charles R Greathouse IV, May 09 2016

CROSSREFS

Cf. A001285, A026492, A026513.

Sequence in context: A136754 A276788 A282625 * A140685 A055666 A251139

Adjacent sequences:  A026495 A026496 A026497 * A026499 A026500 A026501

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

Name and Pari adapted to match offset in A001285 by Sean A. Irvine, Oct 03 2019

STATUS

approved

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Last modified May 18 18:24 EDT 2022. Contains 353823 sequences. (Running on oeis4.)