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Search: id:A019287
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| A019287 |
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Let sigma_m (n) be result of applying sum-of-divisors function m times to n; call n (m,k)-perfect if sigma_m (n) = k*n; sequence gives the (2,10)-perfect numbers. |
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+0
1
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| 480, 504, 13824, 32256, 32736, 1980342, 1396617984, 3258775296
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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See also the Cohen-te Reile links under A019276.
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REFERENCES
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Graeme L. Cohen and Herman J. J. te Riele, Iterating the sum-of-divisors function, Experimental Mathematics, 5 (1996), pp. 93-100.
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LINKS
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Experimental Mathematics, Home Page
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CROSSREFS
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Sequence in context: A025025 A108256 A115157 this_sequence A108876 A083728 A063870
Adjacent sequences: A019284 A019285 A019286 this_sequence A019288 A019289 A019290
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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More terms from Jud McCranie (j.mccranie(AT)comcast.net), Nov 13 2001
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