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Search: id:A066473
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| A066473 |
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Numbers having just seven anti-divisors. |
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+0
1
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| 38, 45, 52, 53, 58, 59, 63, 68, 73, 82, 83, 87, 88, 93, 97, 102, 103, 104, 108, 110, 116, 117, 126, 133, 135, 136, 138, 140, 142, 147, 153, 161, 163, 167, 170, 173, 176, 179, 192, 198, 199, 210, 229, 231, 232, 233, 234, 235, 243, 245, 252, 258, 259, 267, 269
(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[ # ]] == 7 & ]
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CROSSREFS
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Cf. A066272.
Sequence in context: A072585 A050874 A144798 this_sequence A031409 A078550 A133123
Adjacent sequences: A066470 A066471 A066472 this_sequence A066474 A066475 A066476
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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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