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Search: id:A109941
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| A109941 |
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Sum of all n-digit multiples of n. |
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+0
3
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| 45, 2430, 165150, 12370500, 989955000, 82499850000, 7071428928571, 618749955000000, 55000000350000000, 4949999995500000000, 449999999955000000000, 41250000000150000000000
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(2) = 2430, a(2) = 10 +12+...+96+98 = 45*(10+98)/2.
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MATHEMATICA
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Table[Sum[i, {i, n*Ceiling[(10^(n - 1))/n], 10^n - 1, n}], {n, 1, 30}] - Hans Havermann
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CROSSREFS
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Adjacent sequences: A109938 A109939 A109940 this_sequence A109942 A109943 A109944
Sequence in context: A121009 A009989 A095658 this_sequence A035097 A130017 A025755
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 19 2005
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EXTENSIONS
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More terms from Hans Havermann (pxp(AT)rogers.com), Jul 22 2005
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