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

0, 2, 13, 5, 31, 27, 10, 8, 59, 63, 54, 52, 20, 22, 49, 17, 115, 119, 126, 124, 108, 110, 121, 105, 40, 42, 37, 45, 103, 99, 34, 32, 227, 231, 238, 236, 252, 254, 233, 249, 216, 218, 213, 221, 247, 243, 210, 208, 80, 82, 93, 85, 79, 75, 90, 88, 203, 207, 198, 196, 68, 70, 193, 65

Offset

0,2

Links

Antti Karttunen, Table of n, a(n) for n = 0..8191

Formula

a(n) = A003188(3*A006068(n)).

Prog

(Scheme) (define (A268722 n) (A003188 (* 3 (A006068 n))))
(Python)
def A268722(n):
    k, m = n, n>>1
    while m > 0:
        k ^= m
        m >>= 1
    return (a:=3*k)^ a>>1 # Chai Wah Wu, Jun 30 2022

Crossrefs

Cf. A003188, A006068.

Row 2 and column 2 of array A268725.

Sequence in context: A129733 A084160 A238139 * A213828 A324003 A176466

Adjacent sequences: A268719 A268720 A268721 * A268723 A268724 A268725

Keyword

nonn

Author

Antti Karttunen, Feb 13 2016

Status

approved