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 A070397 a(n) = 6^n mod 25. 1
 1, 6, 11, 16, 21, 1, 6, 11, 16, 21, 1, 6, 11, 16, 21, 1, 6, 11, 16, 21, 1, 6, 11, 16, 21, 1, 6, 11, 16, 21, 1, 6, 11, 16, 21, 1, 6, 11, 16, 21, 1, 6, 11, 16, 21, 1, 6, 11, 16, 21, 1, 6, 11, 16, 21, 1, 6, 11, 16, 21, 1, 6, 11, 16, 21, 1, 6, 11, 16, 21, 1, 6, 11, 16, 21, 1, 6, 11, 16 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS G. C. Greubel, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,1). FORMULA a(n) = (1/10)*(51*(n mod 5)+((n+1) mod 5)+((n+2) mod 5)+((n+3) mod 5)+((n+4) mod 5)). - Paolo P. Lava, Apr 16 2010 a(n) = a(n-5). - R. J. Mathar, Apr 20 2010 G.f.: ( -1-6*x-11*x^2-16*x^3-21*x^4 ) / ((x-1)*(1+x+x^2+x^3+x^4)).  - R. J. Mathar, Apr 20 2010 MATHEMATICA PowerMod[6, Range[0, 80], 25] (* Harvey P. Dale, Jul 22 2013 *) PROG (Sage) [power_mod(6, n, 25)for n in xrange(0, 79)] # Zerinvary Lajos, Nov 27 2009 (PARI) a(n) = lift(Mod(6, 25)^n); \\ Altug Alkan, Mar 18 2016 CROSSREFS Sequence in context: A287577 A118659 A072353 * A080904 A081746 A080900 Adjacent sequences:  A070394 A070395 A070396 * A070398 A070399 A070400 KEYWORD nonn,easy AUTHOR N. J. A. Sloane, May 12 2002 STATUS approved

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