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A074538
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2^n + 5^n + 7^n.
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1
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3, 14, 78, 476, 3042, 19964, 133338, 901796, 6155682, 42307244, 292241898, 2026156916, 14085431922, 98109721724, 684326604858, 4778079120836, 33385518525762, 233393453571404, 1632228295438218, 11417968672225556
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..200
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FORMULA
| G.f.: 1/(1-2*x)+1/(1-5*x)+1/(1-7*x). E.g.f.: exp(2*x)+exp(5*x)+exp(7*x). [From Mohammad K. Azarian (azarian(AT)evansville.edu), Dec 27 2008]
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MATHEMATICA
| Table[2^n + 5^n + 7^n, {n, 0, 20}]
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PROG
| (MAGMA) [2^n + 5^n + 7^n: n in [0..25]]; // Vincenzo Librandi, Jun 11 2011
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CROSSREFS
| Cf. A001550, A001576, A034513, A001579, A074501 - A074580.
Sequence in context: A198656 A048779 A052186 * A001564 A059276 A003169
Adjacent sequences: A074535 A074536 A074537 * A074539 A074540 A074541
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KEYWORD
| easy,nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 23 2002
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