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A074534 a(n) = 2^n + 4^n + 7^n. 1
3, 13, 69, 415, 2673, 17863, 121809, 840055, 5830593, 40616263, 283524849, 1981523095, 13858068513, 96956127463, 678491524689, 4748635284535, 33237225602433, 232647693987463, 1628482317649329, 11399170063804375 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200

Index entries for linear recurrences with constant coefficients, signature (13,-50,56).

FORMULA

From Mohammad K. Azarian, Dec 27 2008: (Start)

G.f.: 1/(1-2*x) + 1/(1-4*x) + 1/(1-7*x).

E.g.f.: exp(2*x) + exp(4*x) + exp(7*x). (End)

MATHEMATICA

Table[2^n + 4^n + 7^n, {n, 0, 20}]

PROG

(MAGMA) [2^n + 4^n + 7^n: n in [0..25]]; // Vincenzo Librandi, Jun 11 2011

CROSSREFS

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

Sequence in context: A284718 A284719 A128079 * A153395 A243688 A088714

Adjacent sequences:  A074531 A074532 A074533 * A074535 A074536 A074537

KEYWORD

easy,nonn

AUTHOR

Robert G. Wilson v, Aug 23 2002

STATUS

approved

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Last modified May 21 10:48 EDT 2019. Contains 323443 sequences. (Running on oeis4.)