A026517 a(n) = t(5n), where t = A001285 (Thue-Morse sequence).

1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 2, 2, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 2, 1, 1, 1, 1, 2, 2, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 2, 2, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 1, 2, 2, 2, 2, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 2, 2, 1, 2, 1, 2, 2, 2, 2, 2, 1, 2, 1, 1, 2, 2

Offset: 0

Author

Clark Kimberling

Keywords

• nonn

Links

• Paolo Xausa, Table of n, a(n) for n = 0..10000
• Michael Gilleland, Some Self-Similar Integer Sequences.

Crossrefs

Cf. A001285.

Programs

Mathematica

ThueMorse[Range[0, 500, 5]] + 1 (* Paolo Xausa, Nov 28 2024 *)

PARI

a(n)=1+hammingweight(5*n)%2 \\ Charles R Greathouse IV, May 09 2016

Extensions

Name and Pari code corrected by Sean A. Irvine, Oct 05 2019