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A099674
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Partial sums of repdigits of A002281.
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1
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7, 84, 861, 8638, 86415, 864192, 8641969, 86419746, 864197523, 8641975300, 86419753077, 864197530854, 8641975308631, 86419753086408, 864197530864185, 8641975308641962, 86419753086419739, 864197530864197516
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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FORMULA
| a(n) = (7/81)*(10^(n+1)-9*n-10) - R. Piyo (nagoya314(AT)yahoo.com), Dec 10 2004
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EXAMPLE
| 7+77+777+7777+77777=a[5]=86415
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MATHEMATICA
| <<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
| Cf. A057932, A002275-A002283, A099669-A099675.
Sequence in context: A053128 A027819 A177009 * A067413 A166178 A034323
Adjacent sequences: A099671 A099672 A099673 * A099675 A099676 A099677
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KEYWORD
| base,nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Nov 17 2004
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