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REFERENCES
| D. Minoli, Issues in non-linear hyperperfect numbers, Math. Comp., 34 (1980), 639-645.
J. Roberts, Lure of the Integers, Math. Assoc. America, 1992, p. 177.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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EXTENSIONS
| Jud McCranie (JudMcCranie(AT)ugaalum.uga.edu) reports that the following terms are known:
6,21,325,1950625,?,301,?,?,?,159841,10693,697,?,?,?,
69091933912976476978420033,?,1333,51301,?,?,
865004941741938633917612789573739286076451841,?,?,?,?,?
where the missing terms, if they exist, are > 10^11. The large terms for 16 and 22 are the smallest known (7/98).
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