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 A070387 a(n) = 5^n mod 41. 3
 1, 5, 25, 2, 10, 9, 4, 20, 18, 8, 40, 36, 16, 39, 31, 32, 37, 21, 23, 33, 1, 5, 25, 2, 10, 9, 4, 20, 18, 8, 40, 36, 16, 39, 31, 32, 37, 21, 23, 33, 1, 5, 25, 2, 10, 9, 4, 20, 18, 8, 40, 36, 16, 39, 31, 32, 37, 21, 23, 33, 1, 5, 25, 2, 10, 9, 4, 20, 18, 8, 40, 36, 16, 39, 31, 32, 37 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS G. C. Greubel, Table of n, a(n) for n = 0..1000 FORMULA From R. J. Mathar, Apr 20 2010: (Start) a(n) = a(n-1) - a(n-10) + a(n-11). G.f.: ( -1-4*x-20*x^2+23*x^3-8*x^4+x^5+5*x^6-16*x^7+2*x^8+10*x^9-33*x^10 ) / ( (x-1)*(x^2+1)*(x^8-x^6+x^4-x^2+1) ). (End) a(n) = a(n-20). - G. C. Greubel, Mar 16 2016 MATHEMATICA PowerMod[5, Range[0, 50], 41] (* G. C. Greubel, Mar 16 2016 *) PROG (Sage) [power_mod(5, n, 41) for n in xrange(0, 77)] # Zerinvary Lajos, Nov 26 2009 (PARI) a(n) = lift(Mod(5, 41)^n); \\ Altug Alkan, Mar 16 2016 CROSSREFS Sequence in context: A270590 A271378 A175555 * A123748 A050108 A070386 Adjacent sequences:  A070384 A070385 A070386 * A070388 A070389 A070390 KEYWORD nonn AUTHOR N. J. A. Sloane, May 12 2002 STATUS approved

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