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2, 16, 128, 1024, 8192, 65536, 524288, 4194304, 33554432, 268435456, 2147483648, 17179869184, 137438953472, 1099511627776, 8796093022208, 70368744177664, 562949953421312, 4503599627370496, 36028797018963968, 288230376151711744
(list;
graph;
refs;
listen;
history;
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internal format)
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OFFSET
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0,1
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COMMENTS
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1/2 + 1/16 + 1/128 + 1/1024 + ... = 4/7 [From Gary W. Adamson, Aug 29 2008]
a(n) = A157176(A016921(n)) = A157176(A016933(n)). [From Reinhard Zumkeller, Feb 24 2009]
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 0..200
Tanya Khovanova, Recursive Sequences
Index to divisibility sequences
Index to sequences with linear recurrences with constant coefficients, signature (8).
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FORMULA
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a(n)=8*a(n-1), n>0 ; a(0)=2 . G.f.: 2/(1-8x). [From Philippe DELEHAM, Nov 23 2008]
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MAPLE
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seq(2^(3*n+1), n=0..19); # Nathaniel Johnston, Jun 26 2011
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MATHEMATICA
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Table[2^n, {n, 1, 100, 3}] (* and *) 2^(3*Range[0, 40] + 1) (* From Vladimir Joseph Stephan Orlovsky, Jun 14 2011 *)
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PROG
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(MAGMA) [2^(3*n+1): n in [0..30]]; // Vincenzo Librandi, May 04 2011
(PARI) a(n)=2<<(3*n) \\ Charles R Greathouse IV, Jun 14 2011
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CROSSREFS
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Cf. A013731.
Sequence in context: A069868 A208073 A022027 * A214623 A161737 A171451
Adjacent sequences: A013727 A013728 A013729 * A013731 A013732 A013733
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KEYWORD
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nonn,easy,changed
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AUTHOR
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N. J. A. Sloane.
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STATUS
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approved
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