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Search: id:A099676
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| 9, 108, 1107, 11106, 111105, 1111104, 11111103, 111111102, 1111111101, 11111111100, 111111111099, 1111111111098, 11111111111097, 111111111111096, 1111111111111095, 11111111111111094, 111111111111111093
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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a(n) = (10/9)*(10^n-1)-n - R. Piyo (nagoya314(AT)yahoo.com), Dec 10 2004
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EXAMPLE
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9+99+999+9999+99999=a[5]=111105
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MAPLE
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a:=n->sum((10^(n-j)-1^(n-j)), j=0..n): seq(a(n), n=1..17); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 15 2007
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MATHEMATICA
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<<NumberTheory`NumberTheoryFunctions` Table[{k, Table[Apply[Plus, Table[k*(10^n-1)/9, {n, 1, m}]], {m, 1, 35}]}, {k, 1, 9}]
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CROSSREFS
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Cf. A057932, A002275-A002283, A099669-A099674.
Sequence in context: A039619 A080505 A104224 this_sequence A051606 A001691 A058421
Adjacent sequences: A099673 A099674 A099675 this_sequence A099677 A099678 A099679
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KEYWORD
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base,nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Nov 17 2004
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