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Search: id:A019291
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| A019291 |
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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 (2,14)-perfect numbers. |
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1
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| 217728, 1278720, 2983680, 5621760, 14008320, 298721280, 955367424, 1874780160
(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: A118875 A077640 A078520 this_sequence A157377 A090873 A072189
Adjacent sequences: A019288 A019289 A019290 this_sequence A019292 A019293 A019294
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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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