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5, 10, 20, 40, 80, 160, 320, 640, 1280, 2560, 5120, 10240, 20480, 40960, 81920, 163840, 327680, 655360, 1310720, 2621440, 5242880, 10485760, 20971520, 41943040, 83886080, 167772160, 335544320, 671088640, 1342177280, 2684354560, 5368709120, 10737418240
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| Same as Pisot sequences E(5,10), L(5,10), P(5,10), T(5,10). See A008776 for definitions of Pisot sequences.
The first differences are the sequence itself. - Alexandre Wajnberg & Eric Angelini (alexandre.wajnberg(AT)ulb.ac.be), Sep 07 2005
5 times powers of 2. [From Omar E. Pol (info(AT)polprimos.com), Dec 16 2008]
a(n) = A173786(n+2,n) for n>1. [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Feb 28 2010]
Subsequence of A051916. [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 20 2010]
With the addition of "2, 3," at the beginning, this sequence gives terms (n + 3) through the first term greater than 2^n, for n odd, of the negabinary Keith sequence for 2^n, thus proving that with the exception of 2 itself, no odd-indexed power of 2 is a negabinary Keith number (see A188381). [From Alonso del Arte, Feb 02 2012]
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..238
Index entries for sequences related to linear recurrences with constant coefficients, signature (2).
Tanya Khovanova, Recursive Sequences
INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 1003
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FORMULA
| a(n) = 5*2^n. a(n) = 2a(n-1).
G.F.: 5/(1-2*x)
If m is a term greater than 5 of this sequence then m=5*phi(phi(m)). - Farideh Firoozbakht (mymontain(AT)yahoo.com), Aug 16 2005
a(n) = A118416(n+1,3) for n>2. - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Apr 27 2006
a(n) = A000079(n)*5. [From Omar E. Pol (info(AT)polprimos.com), Dec 16 2008]
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MATHEMATICA
| Table[5*2^n, {n, 0, 31}] (* From Vladimir Orlovsky, Dec 16 2008 *)
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PROG
| (MAGMA) [5*2^n: n in [0..40]]; // Vincenzo Librandi, Apr 28 2011
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CROSSREFS
| Row sums of (4, 1)-Pascal triangle A093561.
Row sums of (9, 1)-Pascal triangle A093644.
Row sums of (1, 4)-Pascal triangle A095666 (with leading 4).
Cf. A000079. [From Omar E. Pol (info(AT)polprimos.com), Dec 16 2008]
Sequence in context: A107486 A193839 * A146523 A102260 A023383 A092407
Adjacent sequences: A020711 A020712 A020713 * A020715 A020716 A020717
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KEYWORD
| nonn,easy,changed
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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