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Search: id:A099675
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| 8, 96, 984, 9872, 98760, 987648, 9876536, 98765424, 987654312, 9876543200, 98765432088, 987654320976, 9876543209864, 98765432098752, 987654320987640, 9876543209876528, 98765432098765416, 987654320987654304
(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) = (8/81)*(10^(n+1)-9*n-10) - R. Piyo (nagoya314(AT)yahoo.com), Dec 10 2004
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EXAMPLE
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8+88+888+8888+88888=a[5]=98760
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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[8/9*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, A099669-A099675.
Sequence in context: A074114 A069650 A066424 this_sequence A060458 A098430 A034177
Adjacent sequences: A099672 A099673 A099674 this_sequence A099676 A099677 A099678
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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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