OFFSET
1,1
COMMENTS
a(6) > 10^12. - Giovanni Resta, Oct 28 2012
EXAMPLE
2158803990 is in the sequence because sigma(2158803990)
=6951619584=7*993088512=7*reversal(2158803990).
CROSSREFS
KEYWORD
base,more,nonn
AUTHOR
Farideh Firoozbakht, Feb 12 2006
EXTENSIONS
a(5) from Donovan Johnson, Dec 21 2008
STATUS
approved