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

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

Offset: 1

Author

Ian Duff, Jun 08 2008

Keywords

• base
• full
• nonn
• fini

Examples

			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.