A116311 Numbers k such that k*(k+7) gives the concatenation of two numbers m and m+3.

8445, 8810, 69125298546226023971, 69855225553525294044, 74604750601020544519, 75334677608319814592, 92496418993920707746, 93226346001219977819, 97975871048715228294, 98705798056014498367

Offset: 1

Author

Giovanni Resta, Feb 06 2006

Keywords

• nonn
• base

Examples

			8810 * 8817 = 7767//7770, where // denotes concatenation.
		

Crossrefs

Cf. A116180, A116298, A116310, A116312, A116319.