A115748 Numbers n such that sigma(n)=7*reversal(n).

63301, 651001, 6967932, 2158803990, 88858402692

Offset: 1

Author

Farideh Firoozbakht, Feb 12 2006

Keywords

• base
• more
• nonn

Comments

a(6) > 10^12. - Giovanni Resta, Oct 28 2012

Examples

			2158803990 is in the sequence because sigma(2158803990)
=6951619584=7*993088512=7*reversal(2158803990).
		

Crossrefs

Cf. A069216, A105324, A114928.

Extensions

a(5) from Donovan Johnson, Dec 21 2008