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Search: id:A099670
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| 3, 36, 369, 3702, 37035, 370368, 3703701, 37037034, 370370367, 3703703700, 37037037033, 370370370366, 3703703703699, 37037037037032, 370370370370365, 3703703703703698, 37037037037037031, 370370370370370364
(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)=(3/81)*(10^(n+1)-9*n-10) - R. Piyo (nagoya314(AT)yahoo.com), Dec 10 2004
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EXAMPLE
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3+33+333+3333=a[4]=3702
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MAPLE
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a:=n->sum((10^(n-j)-1^(n-j))/3, j=0..n): seq(a(n), n=1..18); - 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}]
Table[3/9*Sum[10^i - 1, {i, n}], {n, 18}] (from Robert G. Wilson v Nov 20 2004)
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CROSSREFS
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Cf. A057932, A002275-A002283.
Sequence in context: A026121 A055303 A068177 this_sequence A006587 A091482 A121245
Adjacent sequences: A099667 A099668 A099669 this_sequence A099671 A099672 A099673
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Nov 17 2004
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