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Search: id:A019289
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| A019289 |
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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 (2,12)-perfect numbers. |
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+0
1
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| 2200380, 8801520, 14913024, 35206080, 140896000, 459818240, 775898880, 2253189120
(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: A166930 A049359 A105711 this_sequence A051447 A034608 A046444
Adjacent sequences: A019286 A019287 A019288 this_sequence A019290 A019291 A019292
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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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