cp's OEIS Frontend

A268722 a(n) = A003188(3*A006068(n)), where A003188 is binary Gray code and A006068 is its inverse.

%I A268722 #11 Jun 30 2022 14:43:46
%S A268722 0,2,13,5,31,27,10,8,59,63,54,52,20,22,49,17,115,119,126,124,108,110,
%T A268722 121,105,40,42,37,45,103,99,34,32,227,231,238,236,252,254,233,249,216,
%U A268722 218,213,221,247,243,210,208,80,82,93,85,79,75,90,88,203,207,198,196,68,70,193,65
%N A268722 a(n) = A003188(3*A006068(n)), where A003188 is binary Gray code and A006068 is its inverse.
%H A268722 Antti Karttunen, <a href="/A268722/b268722.txt">Table of n, a(n) for n = 0..8191</a>
%F A268722 a(n) = A003188(3*A006068(n)).
%o A268722 (Scheme) (define (A268722 n) (A003188 (* 3 (A006068 n))))
%o A268722 (Python)
%o A268722 def A268722(n):
%o A268722     k, m = n, n>>1
%o A268722     while m > 0:
%o A268722         k ^= m
%o A268722         m >>= 1
%o A268722     return (a:=3*k)^ a>>1 # _Chai Wah Wu_, Jun 30 2022
%Y A268722 Cf. A003188, A006068.
%Y A268722 Row 2 and column 2 of array A268725.
%K A268722 nonn
%O A268722 0,2
%A A268722 _Antti Karttunen_, Feb 13 2016