A269305 2^n mod 27 successively displaced by 0, 3, 6, 9, etc.

1, 2, 4, 8, 16, 5, 10, 20, 13, 26, 25, 23, 19, 11, 22, 17, 7, 14, 4, 5, 7, 11, 19, 8, 13, 23, 16, 2, 1, 26, 22, 14, 25, 20, 10, 17, 7, 8, 10, 14, 22, 11, 16, 26, 19, 5, 4, 2, 25, 17, 1, 23, 13, 20, 10, 11, 13, 17, 25, 14, 19, 2, 22, 8, 7, 5, 1, 20

Offset: 0

Author

Joe Slater, Feb 22 2016

Keywords

• nonn
• easy
• less

Comments

Repeats with period 18*9 = 162.

Crossrefs

Cf. A070337.

Programs

Magma

[(2^n+3*Floor(n/18)) mod 27: n in [0..80]]; // Vincenzo Librandi, Feb 23 2016

Mathematica

Table[Mod[(2^n + 3 Floor[n/18]), 27], {n, 0, 70}] (* Vincenzo Librandi, Feb 23 2016 *)

PARI

a(n) = (2^n + 3*(n\18)) % 27; \\ Michel Marcus, Feb 24 2016

Formula

a(n) = (2^n + 3*floor(n/18)) mod 27.