1,2
R. K. Guy, Unsolved Problems in Number Theory, Sect. B2.
Roberts, Lure of the Integers, see Integer 28, p. 177.
J. S. McCranie, A study of hyperperfect numbers, J. Int. Seqs. Vol. 3 (2000) #P00.1.3
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Cf. A034897.
Sequence in context: A120108 A060556 A132813 * A059300 A046803 A121468
Adjacent sequences: A034895 A034896 A034897 * A034899 A034900 A034901
nonn
Judson S. McCranie (JudMcCranie(AT)ugaalum.uga.edu)