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

Author

Antti Karttunen, Feb 13 2016

Keywords

• nonn

Links

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

Crossrefs

Cf. A003188, A006068.

Row 2 and column 2 of array A268725.

Programs

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

Scheme

(define (A268722 n) (A003188 (* 3 (A006068 n))))

Formula

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