OFFSET
1,1
COMMENTS
These numbers are clearly analogous to perfect numbers.
EXAMPLE
a[1]=6 is the first even perfect number;
a[7]=24 corresponds to A096821(1)=24;
a[4]=151115727449904501489664=2^38*(2^39-7)=274877906944*549755813881;
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Jul 13 2004
STATUS
approved