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A196305
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a(n) = 15*2^n - 1.
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2
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14, 29, 59, 119, 239, 479, 959, 1919, 3839, 7679, 15359, 30719, 61439, 122879, 245759, 491519, 983039, 1966079, 3932159, 7864319, 15728639, 31457279, 62914559, 125829119, 251658239, 503316479, 1006632959, 2013265919, 4026531839, 8053063679, 16106127359
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OFFSET
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0,1
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COMMENTS
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Primes of this sequence are in A196940.
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (3,-2).
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FORMULA
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a(n) = 15*2^n - 1.
a(n) = A033484(n+1) + A083705(n).
From Philippe Deléham, Feb 17 2014: (Start)
a(n) = 2*a(n-1) + 1.
a(n) = 3*a(n-2) - 2*a(n-2). (End)
a(n) = A110286(n) - 1. - Philippe Deléham, Feb 17 2014
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PROG
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(MAGMA) [15*2^n -1 : n in [0..50]];
(PARI) a(n)=15<<n-1 \\ Charles R Greathouse IV, Oct 08 2011
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CROSSREFS
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Cf. A033484, A083705, A110286 (first differences).
Sequence in context: A124681 A195145 A263119 * A041386 A041388 A042617
Adjacent sequences: A196302 A196303 A196304 * A196306 A196307 A196308
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KEYWORD
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nonn,easy
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AUTHOR
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Brad Clardy, Oct 07 2011
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STATUS
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approved
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