OFFSET
1,2
EXAMPLE
a(1)=1 as 100 is the only 3-digit multiple of 1 whose digits sum to 1, while a(19)=1 as 874 is the only 3-digit multiple of 19 with the property.
MATHEMATICA
dm3[n_]:=Module[{min=n*Ceiling[100/n], max=n*Floor[999/n]}, Length[ Select[Range[min, max, n], Total[IntegerDigits[#]]==n&]]]; Array[dm3, 30] (* Harvey P. Dale, Dec 18 2011 *)
CROSSREFS
KEYWORD
base,full,nonn,fini
AUTHOR
Ian Duff, Jun 08 2008
STATUS
approved