A139378 Number of 2-digit multiples of n whose digits sum to n.

1, 1, 3, 1, 1, 3, 1, 1, 9

Offset

1,3

Links

Table of n, a(n) for n=1..9.

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: A139002 A251913 A285012 * A038500 A091840 A083985

Adjacent sequences: A139375 A139376 A139377 * A139379 A139380 A139381

Keyword

base,full,nonn,fini

Author

Ian Duff, Jun 08 2008

Status

approved