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A070416
a(n) = 7^n mod 32.
1
1, 7, 17, 23, 1, 7, 17, 23, 1, 7, 17, 23, 1, 7, 17, 23, 1, 7, 17, 23, 1, 7, 17, 23, 1, 7, 17, 23, 1, 7, 17, 23, 1, 7, 17, 23, 1, 7, 17, 23, 1, 7, 17, 23, 1, 7, 17, 23, 1, 7, 17, 23, 1, 7, 17, 23, 1, 7, 17, 23, 1, 7, 17, 23, 1, 7, 17, 23, 1, 7, 17, 23, 1, 7, 17, 23, 1, 7, 17, 23, 1, 7, 17, 23
OFFSET
0,2
FORMULA
From R. J. Mathar, Apr 20 2010: (Start)
a(n) = a(n-4).
G.f.: ( -1 - 7*x - 17*x^2 - 23*x^3 ) / ( (x-1)*(1+x)*(1+x^2) ). (End)
E.g.f.: 9*cosh(x) + 15*sinh(x) - 8*cos(x) - 8*sin(x). - G. C. Greubel, Mar 20 2016
MATHEMATICA
PowerMod[7, Range[0, 50], 32] (* G. C. Greubel, Mar 20 2016 *)
PROG
(Sage) [power_mod(7, n, 32)for n in range(0, 84)] # Zerinvary Lajos, Nov 27 2009
(PARI) a(n) = lift(Mod(7, 32)^n); \\ Altug Alkan, Mar 20 2016
(Magma) [Modexp(7, n, 32): n in [0..100]]; // Bruno Berselli, Mar 22 2016
CROSSREFS
Sequence in context: A327830 A144695 A125244 * A087168 A247560 A215824
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, May 12 2002
STATUS
approved