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A070412
a(n) = 7^n mod 27.
1
1, 7, 22, 19, 25, 13, 10, 16, 4, 1, 7, 22, 19, 25, 13, 10, 16, 4, 1, 7, 22, 19, 25, 13, 10, 16, 4, 1, 7, 22, 19, 25, 13, 10, 16, 4, 1, 7, 22, 19, 25, 13, 10, 16, 4, 1, 7, 22, 19, 25, 13, 10, 16, 4, 1, 7, 22, 19, 25, 13, 10, 16, 4, 1, 7, 22, 19, 25, 13, 10, 16, 4, 1, 7, 22, 19, 25, 13
OFFSET
0,2
COMMENTS
Period 9: repeat [1, 7, 22, 19, 25, 13, 10, 16, 4]. - Wesley Ivan Hurt, Feb 28 2014
FORMULA
From R. J. Mathar, Apr 20 2010: (Start)
a(n) = a(n-9).
G.f.: ( -1-7*x- 22*x^2-19*x^3-25*x^4-13*x^5-10*x^6-16*x^7-4*x^8 ) / ( (x-1)*(1+x+x^2)*(x^6+x^3+1) ). (End)
PROG
(Sage) [power_mod(7, n, 27) for n in range(0, 78)] # Zerinvary Lajos, Nov 27 2009
(PARI) a(n) = lift(Mod(7, 27)^n); \\ Altug Alkan, Mar 20 2016
(Magma) [Modexp(7, n, 27): n in [0..100]]; // Bruno Berselli, Mar 22 2016
CROSSREFS
Sequence in context: A101119 A217014 A200886 * A286572 A055575 A297712
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, May 12 2002
STATUS
approved