A116107 Numbers k such that k concatenated with k-8 gives the product of two numbers which differ by 7.

52, 63716866, 48793687600063875363014809897052, 60020753655608135708762056127156, 60446518621981165303188950156776, 71135436903815748345367595855336, 72876856643103028189103298533248

Offset: 1

Author

Giovanni Resta, Feb 06 2006

Keywords

• nonn
• base

Comments

Also numbers n such that n concatenated with n-2 gives the product of two numbers which differ by 5.

Examples

			63716866//63716864 = 79822843 * 79822848, where // denotes concatenation.
		

Crossrefs

Cf. A116099, A116106, A115429, A116112, A116238, A115426, A116146, A116276.

Extensions

Edited by N. J. A. Sloane, Apr 15 2007