1,1
a(6) > 10^12. 8992165119733, 42052982615431201 and 1978419655654505210563957 are also terms. - Donovan Johnson, Nov 03 2011
J. S. McCranie, A study of hyperperfect numbers, J. Int. Seqs. Vol. 3 (2000) #P00.1.3
Cf. A007593.
Sequence in context: A035862 A003907 A043613 * A183646 A145494 A206049
Adjacent sequences: A028498 A028499 A028500 * A028502 A028503 A028504
nonn
Jud McCranie (JudMcCranie(AT)ugaalum.uga.edu)
a(5) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Nov 03 2011