A116224 Numbers k such that k concatenated with k+9 gives the product of two numbers which differ by 9.

23, 27, 10357253, 10577583, 45531191, 45991881, 12823841629508531559818193, 17153953024599261169512903, 34319291138166088695725681, 41203057971387248588060861, 75861857890090990570762781

Offset: 1

Author

Giovanni Resta, Feb 06 2006

Keywords

• nonn
• base

Examples

			45991881//45991890 = 67817310 * 67817319, where // denotes concatenation.
		

Crossrefs

Cf. A116216, A116223, A116355.