2,1
A. Flammenkamp, The Multiply Perfect Number Page
J. C. Moxham, Multiply perfect numbers
R. M. Sorli, Multiply perfect numbers
Cf. A007539, A007691.
Sequence in context: A154526 A126144 A171643 * A163637 A171015 A084424
Adjacent sequences: A071999 A072000 A072001 * A072003 A072004 A072005
hard,more,nonn
Lekraj Beedassy (blekraj(AT)yahoo.com), Jun 18 2002