A116187 Numbers k such that k concatenated with k+4 gives the product of two numbers which differ by 6.

12, 43, 20440836, 30017751, 61336887, 52400871197755334426147587, 53651708763838760619655612, 56652002793835820319625612, 57952296063256269823192087, 17684775866714240650923831481623

Offset: 1

Author

Giovanni Resta, Feb 06 2006

Keywords

• nonn
• base

Comments

Also numbers k such that k concatenated with k+9 gives the product of two numbers which differ by 4. For proof that this is the same sequence compare A116133.

Examples

			61336887//61336891 = 78317867 * 78317873, where // denotes concatenation. 61336887//61336896 = 78317868 * 78317872.
		

Crossrefs

Cf. A116173, A115429, A116133, A116194, A116318.

Cf. A116193, A116180, A116350.

Extensions

Edited by N. J. A. Sloane, Apr 11 2007