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A008892
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Aliquot sequence starting at 276.
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4
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276, 396, 696, 1104, 1872, 3770, 3790, 3050, 2716, 2772, 5964, 10164, 19628, 19684, 22876, 26404, 30044, 33796, 38780, 54628, 54684, 111300, 263676, 465668, 465724, 465780, 1026060, 2325540, 5335260
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| It is an open question whether this sequence ever reaches 0. See A098007 and the Zimmermann link.
The aliquot sequence starting at 306 joins this sequence after one step.
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REFERENCES
| R. K. Guy, Unsolved Problems in Number Theory, B6.
R. K. Guy and J. L. Selfridge, Interim report on aliquot series, pp. 557-580 of Proceedings Manitoba Conference on Numerical Mathematics. University of Manitoba, Winnipeg, Oct 1971.
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LINKS
| T. D. Noe, Table of n, a(n) for n = 0..670
Christophe CLAVIER, Aliquot Sequences
Christophe CLAVIER, Trajectory of 276 - the first 1576 terms and their factorizations
Christophe CLAVIER, Trajectory of 276 - the first 1576 terms and their factorizations [Cached copy]
P. Zimmermann, Latest information
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MAPLE
| f := proc(n) option remember; if n = 0 then 276; else sigma(f(n-1))-f(n-1); fi; end:
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CROSSREFS
| Cf. A098007.
Sequence in context: A084802 A003903 A131884 * A133215 A015232 A128382
Adjacent sequences: A008889 A008890 A008891 * A008893 A008894 A008895
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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