|
Search: id:A066467
|
|
|
| A066467 |
|
Numbers having just two anti-divisors. |
|
+0
1
|
|
| 5, 8, 9, 12, 16, 24, 36, 64, 576, 4096, 65536
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
See A066272 for definition of anti-divisor.
|
|
LINKS
|
Jon Perry, The Anti-Divisor
Jon Perry, The Anti-divisor [Cached copy]
Jon Perry, The Anti-divisor: Even More Anti-Divisors [Cached copy]
|
|
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[10^5], Length[ antid[ # ]] == 2 & ]
|
|
CROSSREFS
|
Cf. A066272.
Sequence in context: A066812 A100832 A034812 this_sequence A072833 A047616 A045221
Adjacent sequences: A066464 A066465 A066466 this_sequence A066468 A066469 A066470
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 02 2002
|
|
|
Search completed in 0.002 seconds
|
