A116211 Numbers k such that k concatenated with k+7 gives the product of two numbers which differ by 9.

1953, 3115, 6153, 1016574047215119910181525023, 2440558249789368730986767575, 2560156942576450203707692923, 4639822375038697733267413875, 4868700733912235016077891029

Offset: 1

Author

Giovanni Resta, Feb 06 2006

Keywords

• nonn
• base

Examples

			6153//6160 = 7840 * 7849, where // denotes concatenation.
		

Crossrefs

Cf. A116203, A116210, A116216, A116342.