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Search: id:A099674
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| 7, 84, 861, 8638, 86415, 864192, 8641969, 86419746, 864197523, 8641975300, 86419753077, 864197530854, 8641975308631, 86419753086408, 864197530864185, 8641975308641962, 86419753086419739, 864197530864197516
(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) = (7/81)*(10^(n+1)-9*n-10) - R. Piyo (nagoya314(AT)yahoo.com), Dec 10 2004
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EXAMPLE
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7+77+777+7777+77777=a[5]=86415
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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.
Adjacent sequences: A099671 A099672 A099673 this_sequence A099675 A099676 A099677
Sequence in context: A099668 A053128 A027819 this_sequence A067413 A034323 A058795
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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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