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Search: id:A099669
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| 2, 24, 246, 2468, 24690, 246912, 2469134, 24691356, 246913578, 2469135800, 24691358022, 246913580244, 2469135802466, 24691358024688, 246913580246910, 2469135802469132, 24691358024691354, 246913580246913576
(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)=(2/81)*(10^(n+1)-9*n-10) - R. Piyo (nagoya314(AT)yahoo.com), Dec 10 2004
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EXAMPLE
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2+22+222+2222=a[4]=2468
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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[2/9*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: A025131 A143407 A132596 this_sequence A019520 A061190 A002006
Adjacent sequences: A099666 A099667 A099668 this_sequence A099670 A099671 A099672
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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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