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A026498 a(n) = t(1+3n), where t = A001285 (Thue-Morse sequence). 4

%I #18 Oct 07 2019 14:45:44

%S 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,

%T 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,

%U 2,2,2,2,2,2,2,1,2,1,1,1,2,2,2,1,2,2,2,2,2,2

%N a(n) = t(1+3n), where t = A001285 (Thue-Morse sequence).

%H Michael De Vlieger, <a href="/A026498/b026498.txt">Table of n, a(n) for n = 0..10000</a>

%t Array[1 + Mod[DigitCount[3 # + 1, 2, 1], 2] &, 105, 0] (* _Michael De Vlieger_, Oct 03 2019 *)

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

%Y Cf. A001285, A026492, A026513.

%K nonn

%O 0,1

%A _Clark Kimberling_

%E Name and Pari adapted to match offset in A001285 by _Sean A. Irvine_, Oct 03 2019

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Last modified April 23 11:27 EDT 2024. Contains 371913 sequences. (Running on oeis4.)