A269305 - OEIS

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

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OFFSET

0,2

COMMENTS

Repeats with period 18*9 = 162.

LINKS

Table of n, a(n) for n=0..67.

FORMULA

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

MATHEMATICA

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

PROG

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

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

CROSSREFS

Cf. A070337.

Sequence in context: A050076 A276070 A070337 * A225570 A352391 A178170

Adjacent sequences: A269302 A269303 A269304 * A269306 A269307 A269308

KEYWORD

nonn,easy,less

AUTHOR

Joe Slater, Feb 22 2016

STATUS

approved