|
| |
|
|
A074568
|
|
4^n + 7^n + 8^n.
|
|
1
| |
|
|
3, 19, 129, 919, 6753, 50599, 383889, 2937079, 22607553, 174833479, 1357265649, 10571455639, 82577541153, 646711933159, 5076538019409, 39933007340599, 314712202247553, 2484447507541639, 19642880826869169, 155514358139135959
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,1
|
|
|
LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..1000
|
|
|
FORMULA
| G.f.: 1/(1-4*x)+1/(1-7*x)+1/(1-8*x). E.g.f.: exp(4*x)+exp(7*x)+exp(8*x). [From Mohammad K. Azarian, Dec 30 2008]
|
|
|
MATHEMATICA
| Table[4^n + 7^n + 8^n, {n, 0, 20}]
|
|
|
PROG
| /MAGMA) [4^n + 7^n + 8^n: n in [0..20]]; // Vincenzo Librandi, Aug 14 2011
|
|
|
CROSSREFS
| Cf. A001550, A001576, A034513, A001579, A074501 - A074580.
Sequence in context: A027308 A156069 A058860 * A074713 A199484 A063395
Adjacent sequences: A074565 A074566 A074567 * A074569 A074570 A074571
|
|
|
KEYWORD
| easy,nonn
|
|
|
AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 23 2002
|
| |
|
|
