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A020707 Pisot sequences E(4,8), L(4,8), P(4,8), T(4,8). 8
4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 262144, 524288, 1048576, 2097152, 4194304, 8388608, 16777216, 33554432, 67108864, 134217728, 268435456, 536870912, 1073741824, 2147483648, 4294967296, 8589934592 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Subsequence of A051916. - Reinhard Zumkeller, Mar 20 2010

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..238

Tanya Khovanova, Recursive Sequences

Index to divisibility sequences

Index entries for linear recurrences with constant coefficients, signature (2).

FORMULA

a(n) = 2^(n+2). a(n) = 2*a(n-1).

G.f.: 4/(1-2*x). - Philippe Deléham, Nov 23 2008

MATHEMATICA

2^(Range[0, 50] + 2) (*The same as:*) 2^Range[2, 52] (* Vladimir Joseph Stephan Orlovsky, Jun 09 2011 *)

PROG

(MAGMA) [2^(n+2): n in [0..40]]; // Vincenzo Librandi, Apr 28 2011

(PARI) a(n)=4<<n \\ Charles R Greathouse IV, Apr 08 2012

CROSSREFS

Subsequence of A000079. See A008776 for definitions of Pisot sequences.

Sequence in context: A046055 A186949 * A151821 A147639 A049934 A089890

Adjacent sequences:  A020704 A020705 A020706 * A020708 A020709 A020710

KEYWORD

nonn,easy

AUTHOR

David W. Wilson

STATUS

approved

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Last modified March 25 13:25 EDT 2017. Contains 284080 sequences.