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A007358
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Infinitary multi-perfect numbers.
(Formerly M4266)
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1
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OFFSET
| 1,1
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COMMENTS
| The sequence contains numbers n such that A049417(n) =k*n for some integer k>1. A007357 is the subsequence with quotient k=2. Cohen lists n=120, 73440, 44553600, 252927360, 575409744000 as entries with k=3, provides seven entries with k=4 and two entries with k=5.
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REFERENCES
| G. L. Cohen, personal communication.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| G. L. Cohen, On an integer's infinitary divisors, Math. Comp., 54 (1990), 395-411.
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CROSSREFS
| Sequence in context: A168618 A185288 A189000 * A007357 A002827 A137498
Adjacent sequences: A007355 A007356 A007357 * A007359 A007360 A007361
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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