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Search: id:A020714
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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; listen)
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OFFSET
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0,1
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COMMENT
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Same as Pisot sequences E(5,10), L(5,10), P(5,10), T(5,10). See A008776 for definitions of Pisot sequences.
An autocopy sequence: its first differences are the sequence itself. - Alexandre Wajnberg & Eric Angelini (alexandre.wajnberg(AT)ulb.ac.be), Sep 07 2005
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LINKS
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Tanya Khovanova, Recursive Sequences
INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 1003
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FORMULA
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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 (f.firoozbakht(AT)math.ui.ac.ir), Aug 16 2005
a(n) = A118416(n+1,3) for n>2. - Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Apr 27 2006
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CROSSREFS
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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).
Sequence in context: A026357 A117518 A107486 this_sequence A102260 A102261 A023383
Adjacent sequences: A020711 A020712 A020713 this_sequence A020715 A020716 A020717
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KEYWORD
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nonn
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AUTHOR
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David W. Wilson (davidwwilson(AT)comcast.net)
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