

A269305


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


0



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 A178170 A127824
Adjacent sequences: A269302 A269303 A269304 * A269306 A269307 A269308


KEYWORD

nonn,easy,less


AUTHOR

Joe Slater, Feb 22 2016


STATUS

approved



