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Search: id:A066474
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| A066474 |
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Numbers having just eight anti-divisors. |
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+0
1
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| 85, 98, 112, 113, 200, 256, 265, 312, 364, 400, 420, 441, 481, 484, 544, 625, 729, 761, 800, 924, 925, 1152, 1200, 1444, 1681, 1764, 1849, 1860, 1861, 1936, 2116, 2209, 2245, 2664, 3364, 3481, 3721, 3844, 4704, 5101, 5304, 5476, 5724, 6400, 6889, 7321
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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See A066272 for definition of anti-divisor.
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LINKS
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Jon Perry, The Anti-Divisor
Jon Perry, The Anti-divisor [Cached copy]
Jon Perry, The Anti-divisor: Even More Anti-Divisors [Cached copy]
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MATHEMATICA
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antid[n_] := Select[ Union[ Join[ Select[ Divisors[2n - 1], OddQ[ # ] && # != 1 & ], Select[ Divisors[2n + 1], OddQ[ # ] && # != 1 & ], 2n/Select[ Divisors[ 2*n], OddQ[ # ] && # != 1 &]]] }, # < n & ]]; Select[ Range[10^4], Length[ antid[ # ]] == 8 & ]
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CROSSREFS
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Cf. A066272.
Adjacent sequences: A066471 A066472 A066473 this_sequence A066475 A066476 A066477
Sequence in context: A044978 A095593 A039487 this_sequence A027453 A029471 A083750
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KEYWORD
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nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 02 2002
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