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 A185057 a(n) = n^n! (mod 5). 0
 0, 1, 4, 4, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS For n > 3, periodic with period 5: repeat [1, 0, 1, 1, 1]. LINKS Index entries for linear recurrences with constant coefficients, signature (0, 0, 0, 0, 1). FORMULA a(n) = (2/5)*(2 - cos(2*n*Pi/5) - cos(4*n*Pi/5)) for n > 3. - Wesley Ivan Hurt, Sep 27 2018 MATHEMATICA Table[PowerMod[n, n!, 5], {n, 0, 84}] Join[{0, 1, 4, 4}, LinearRecurrence[{0, 0, 0, 0, 1}, {1, 0, 1, 1, 1}, 81]] (* Ray Chandler, Aug 25 2015 *) CROSSREFS Sequence in context: A204384 A102412 A260043 * A048152 A070430 A336302 Adjacent sequences:  A185054 A185055 A185056 * A185058 A185059 A185060 KEYWORD nonn,easy AUTHOR José María Grau Ribas, Jan 21 2012 STATUS approved

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Last modified April 13 21:24 EDT 2021. Contains 342941 sequences. (Running on oeis4.)