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R. K. Guy, Unsolved Problems in Number Theory, Sect. B2.
Roberts, Lure of the Integers, see Integer 28, p. 177.
Donovan Johnson, Table of n, a(n) for n = 1..10000
J. S. McCranie, A study of hyperperfect numbers, J. Int. Seqs. Vol. 3 (2000) #P00.1.3
Eric Weisstein's World of Mathematics, Hyperperfect Number.
Sequence in context: A060556 A222969 A132813 * A059300 A046803 A121468
Adjacent sequences: A034895 A034896 A034897 * A034899 A034900 A034901
More terms from Donovan Johnson, Nov 20 2012