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A066477
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Numbers having just eleven anti-divisors.
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0
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137, 143, 157, 158, 175, 193, 202, 238, 262, 270, 275, 280, 283, 293, 305, 319, 337, 346, 367, 388, 390, 391, 402, 403, 412, 418, 428, 435, 446, 451, 455, 465, 468, 488, 490, 493, 494, 501, 507, 508, 525, 533, 540, 542, 562, 570, 580, 587, 588, 592, 595
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| See A066272 for definition of anti-divisor.
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LINKS
| 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
| 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[ # ]] == 11 & ]
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CROSSREFS
| Cf. A066272.
Sequence in context: A189998 A138358 A138329 * A139647 A114645 A057879
Adjacent sequences: A066474 A066475 A066476 * A066478 A066479 A066480
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KEYWORD
| nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 02 2002
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