A074574 a(n) = 5^n + 7^n + 8^n.

3, 20, 138, 980, 7122, 52700, 395418, 2998820, 22932642, 176524460, 1365982698, 10616089460, 82804904562, 647865527420, 5082373099578, 39962451176900, 314860495170882, 2485193267125580, 19646626804658058, 155533156747557140

Offset

0,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..300

Index entries for linear recurrences with constant coefficients, signature (20,-131,280).

Formula

0From Mohammad K. Azarian, Dec 30 2008: (Start)

G.f.: 1/(1-5*x) + 1/(1-7*x) + 1/(1-8*x).

E.g.f.: e^(5*x) + e^(7*x) + e^(8*x). (End)

Mathematica

Table[5^n + 7^n + 8^n, {n, 0, 20}]

Prog

(Magma) [5^n + 7^n + 8^n: n in [0..20]]; // Vincenzo Librandi, May 20 2011

Crossrefs

Cf. A001550, A001576, A034513, A001579, A074501-A074580.

Sequence in context: A056306 A056298 A114479 * A267899 A073514 A163065

Adjacent sequences: A074571 A074572 A074573 * A074575 A074576 A074577

Keyword

easy,nonn

Author

Robert G. Wilson v, Aug 23 2002

Status

approved