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Search: id:A034491
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| 2, 8, 50, 344, 2402, 16808, 117650, 823544, 5764802, 40353608, 282475250, 1977326744, 13841287202, 96889010408, 678223072850, 4747561509944, 33232930569602, 232630513987208, 1628413597910450, 11398895185373144
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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Numbers n for which the expression 7^n/(n-1) is an integer. - Paolo P. Lava (ppl(AT)spl.at), May 29 2006
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LINKS
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Index entries for sequences related to linear recurrences with constant coefficients
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FORMULA
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a(n) = 7a(n-1) - 6 = 8a(n-1) - 7a(n-2).
G.f.: 1/(1-x)+1/(1-7*x). E.g.f.: e^x+e^(7*x). [From Mohammad K. Azarian (azarian(AT)evansville.edu), Jan 02 2009]
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MATHEMATICA
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Table[7^n + 1, {n, 0, 20}]
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PROGRAM
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(Other) sage: [sigma(7, n)for n in xrange(0, 20)] # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 04 2009]
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CROSSREFS
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Cf. A000051, A034472, A052539, A034474, A062394, A062395, A062396, A007689, A063376, A063481, A074600 - A074624.
Sequence in context: A046165 A114619 A027047 this_sequence A121677 A120956 A000557
Adjacent sequences: A034488 A034489 A034490 this_sequence A034492 A034493 A034494
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KEYWORD
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easy,nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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