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A050919
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a(n) = n*7^n + 1.
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2
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1, 8, 99, 1030, 9605, 84036, 705895, 5764802, 46118409, 363182464, 2824752491, 21750594174, 166095446413, 1259557135292, 9495123019887, 71213422649146, 531726889113617, 3954718737782520, 29311444762388083, 216579008522089718
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Paul Leyland, Factors of Cullen and Woodall numbers
Paul Leyland, Generalized Cullen and Woodall numbers
Index entries for linear recurrences with constant coefficients, signature (15,-63,49).
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FORMULA
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G.f.: -(42*x^2 - 7*x + 1)/((x-1)*(7*x-1)^2). [Colin Barker, Oct 14 2012]
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MATHEMATICA
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Table[n*7^n+1, {n, 0, 20}] (* or *) LinearRecurrence[{15, -63, 49}, {1, 8, 99}, 20] (* Harvey P. Dale, Nov 23 2013 *)
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PROG
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(MAGMA) [ n*7^n+1: n in [0..20]]; // Vincenzo Librandi, Sep 16 2011
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CROSSREFS
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Cf. A002064.
Sequence in context: A300114 A180927 A091801 * A230343 A293145 A305919
Adjacent sequences: A050916 A050917 A050918 * A050920 A050921 A050922
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane, Dec 30 1999
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STATUS
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approved
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