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Search: id:A117079
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| A117079 |
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a(1) = 1; a(n) = 2*a(n-1) + (number of digits in a(n-1)). |
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+0
1
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| 1, 3, 7, 15, 32, 66, 134, 271, 545, 1093, 2190, 4384, 8772, 17548, 35101, 70207, 140419, 280844, 561694, 1123394, 2246795, 4493597, 8987201, 17974409, 35948826, 71897660, 143795328, 287590665, 575181339, 1150362687, 2300725384
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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1*2+1=3
3*2+1=7
7*2+1=15
15*2+2=3
etc.
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MATHEMATICA
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a[1] = 1; a[n_] := a[n] = 2a[n - 1] + Floor[Log[10, a[n - 1]]] + 1 - Robert G. Wilson v (rgwv(at)rgwv.com), Apr 20 2006
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CROSSREFS
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Sequence in context: A147250 A066175 A132978 this_sequence A026745 A139333 A099444
Adjacent sequences: A117076 A117077 A117078 this_sequence A117080 A117081 A117082
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KEYWORD
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easy,nonn,base
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AUTHOR
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Zededarian Zee (Zededarian(AT)Gmail.com), Apr 19 2006
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EXTENSIONS
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More terms from Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Jonathan Vos Post (jvospost3(AT)gmail.com), Robert G. Wilson v (rgwv(at)rgwv.com) and James Greene (jmg482(AT)psu.edu), Apr 20 2006. Also from Atilla Bora (borabanana(AT)gmail.com), Apr 23 2006
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