A178729 a(n) = n XOR 3n, where XOR is bitwise XOR.

0, 2, 4, 10, 8, 10, 20, 18, 16, 18, 20, 42, 40, 42, 36, 34, 32, 34, 36, 42, 40, 42, 84, 82, 80, 82, 84, 74, 72, 74, 68, 66, 64, 66, 68, 74, 72, 74, 84, 82, 80, 82, 84, 170, 168, 170, 164, 162, 160, 162, 164, 170, 168, 170, 148, 146, 144, 146, 148, 138, 136, 138, 132, 130

Offset

0,2

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..5000

Formula

a(n) = A005351(n) XOR A005352(n) (conjectured).

a(n) = 2 * A184617(n). - Alois P. Heinz, Jul 21 2017

Mathematica

f[n_] := BitXor[n, 3 n]; Array[f, 70, 0] (* Robert G. Wilson v, Jun 09 2010 *)

Prog

(PARI) a(n) = bitxor(n, 3*n); \\ Michel Marcus, Jul 11 2017
(Magma) [BitwiseXor(n, 3*n): n in [0..80]]; // Vincenzo Librandi, Jul 11 2017
(Python)
def A178729(n): return n^ 3*n # Chai Wah Wu, Jun 29 2022

Crossrefs

Cf. A048724, A048725, A178731, A178732, A178733, A178734, A178735, A178736. - Robert G. Wilson v, Jun 09 2010

Cf. A184617.

Sequence in context: A331708 A227289 A200742 * A124108 A173824 A356603

Adjacent sequences: A178726 A178727 A178728 * A178730 A178731 A178732

Keyword

nonn

Author

Dmitry Kamenetsky, Jun 08 2010

Extensions

a(30) onwards from Robert G. Wilson v, Jun 09 2010

Status

approved