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Search: id:A099672
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| 5, 60, 615, 6170, 61725, 617280, 6172835, 61728390, 617283945, 6172839500, 61728395055, 617283950610, 6172839506165, 61728395061720, 617283950617275, 6172839506172830, 61728395061728385, 617283950617283940
(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) = (5/81)*(10^(n+1)-9*n-10) - R. Piyo (nagoya314(AT)yahoo.com), Dec 10 2004
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EXAMPLE
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5+55+555+5555+55555=a[5]=61725
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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[5/9*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: A100906 A126275 A059602 this_sequence A093885 A128574 A120976
Adjacent sequences: A099669 A099670 A099671 this_sequence A099673 A099674 A099675
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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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