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A198853 5*8^n-1 1
4, 39, 319, 2559, 20479, 163839, 1310719, 10485759, 83886079, 671088639, 5368709119, 42949672959, 343597383679, 2748779069439, 21990232555519, 175921860444159, 1407374883553279, 11258999068426239, 90071992547409919 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

The subsequence of primes begins: 20479, 1310719, 1407374883553279, 90071992547409919, 23611832414348226068479, .. generated by exponents n= 4, 6, 16, 18, 24, 90,.... [Jonathan Vos Post, Oct 31 2011]

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (9,-8).

FORMULA

a(n) = 8*a(n-1)+7. a(n) = 9*a(n-1)-8*a(n-2), n>1.

G.f. ( 4+3*x ) / ( (8*x-1)*(x-1) ). - R. J. Mathar, Oct 31 2011

PROG

(MAGMA) [5*8^n-1: n in [0..30]]

CROSSREFS

Sequence in context: A296594 A290559 A059945 * A093851 A224755 A241075

Adjacent sequences:  A198850 A198851 A198852 * A198854 A198855 A198856

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Oct 31 2011

STATUS

approved

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Last modified November 11 18:50 EST 2019. Contains 329031 sequences. (Running on oeis4.)