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A139378
Number of 2-digit multiples of n whose digits sum to n.
0
1, 1, 3, 1, 1, 3, 1, 1, 9
OFFSET
1,3
EXAMPLE
a(1)=1 as 10 is the only 2-digit multiple of 1 whose digits sum to 1, while a(3)=3 as the multiples 12, 21 and 30 have the property.
CROSSREFS
Sequence in context: A373438 A251913 A285012 * A374469 A038500 A091840
KEYWORD
base,full,nonn,fini
AUTHOR
Ian Duff, Jun 08 2008
STATUS
approved