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 A074575 a(n) = 5^n + 7^n + 9^n. 1
 3, 21, 155, 1197, 9587, 78981, 664715, 5684637, 49202147, 429727221, 3779025275, 33407214477, 296514964307, 2639975541861, 23561119043435, 210669211182717, 1886405707312067, 16910575153106901, 151726863592175195 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..300 Index entries for linear recurrences with constant coefficients, signature (21,-143,315). FORMULA From Mohammad K. Azarian, Dec 26 2008: (Start) G.f.: 1/(1-5*x) + 1/(1-7*x) + 1/(1-9*x). E.g.f.: e^(5*x) + e^(7*x) + e^(9*x). (End) MATHEMATICA Table[5^n + 7^n + 9^n, {n, 0, 20}] LinearRecurrence[{21, -143, 315}, {3, 21, 155}, 20] (* Harvey P. Dale, Jul 14 2019 *) PROG (MAGMA) [5^n + 7^n + 9^n: n in [0..20]]; // Vincenzo Librandi, May 20 2011 CROSSREFS Cf. A001550, A001576, A034513, A001579, A074501-A074580. Sequence in context: A155627 A163472 A229809 * A091171 A226560 A026333 Adjacent sequences:  A074572 A074573 A074574 * A074576 A074577 A074578 KEYWORD easy,nonn AUTHOR Robert G. Wilson v, Aug 23 2002 STATUS approved

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Last modified March 29 18:26 EDT 2020. Contains 333116 sequences. (Running on oeis4.)