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A109941
Sum of all n-digit multiples of n.
2
45, 2430, 165150, 12370500, 989955000, 82499850000, 7071428928571, 618749955000000, 55000000350000000, 4949999995500000000, 449999999955000000000, 41250000000150000000000, 3807692307689192307692307, 353571428571466428571428572, 32999999999999850000000000000
OFFSET
1,1
EXAMPLE
a(2) = 2430, a(2) = 10 +12+...+96+98 = 45*(10+98)/2.
MATHEMATICA
Table[Sum[i, {i, n*Ceiling[(10^(n - 1))/n], 10^n - 1, n}], {n, 15}] (* Hans Havermann *)
CROSSREFS
Sequence in context: A342405 A279439 A251443 * A035097 A184286 A130017
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Jul 19 2005
EXTENSIONS
More terms from Hans Havermann, Jul 22 2005
STATUS
approved