A116130 Numbers k such that k concatenated with k-4 gives the product of two numbers which differ by 5.

8, 98, 590, 738, 830, 998, 1080, 4508, 9998, 20660, 29754, 99998, 980300, 999998, 6694218, 9999998, 49826988, 99999998, 117738578, 131505858, 132231404, 176445054, 177285320, 247979808, 252028388, 335180054, 336337790

Offset: 1

Author

Giovanni Resta, Feb 06 2006

Keywords

• nonn
• base

Comments

Also numbers k such that k concatenated with itself gives the product of two numbers which differ by 3.

Examples

			7531357568//7531357564 = 8678339452 * 8678339457, where // denotes concatenation.
		

Crossrefs

Cf. A116124, A116129, A116131, A116099, A116261, A116163, A116136, A116125, A116287.

Extensions

Edited by N. J. A. Sloane, Apr 13 2007