|
Search: id:A097215
|
|
|
| A097215 |
|
Numbers n such that A076078(n)=n and bigomega(n) >= 2; or in other words, A097214, excluding powers of 2. |
|
+0
3
|
|
| 10, 44, 184, 752, 12224, 49024, 61064, 981520, 12580864, 206158168064, 16492668126208, 1080863908958322688, 18374686467592175488, 885443715520878608384, 4703919738602662723328
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
A076078(n) equals the number of sets of distinct positive integers with a least common multiple of n.
|
|
EXAMPLE
|
For example, there are 184 sets of distinct positive integers with a least common multiple of 184.
|
|
MATHEMATICA
|
f[n_] := Block[{d = Divisors[n]}, Plus @@ (MoebiusMu[n/d](2^DivisorSigma[0, d] - 1))]; t = Union[ Table[ f[n], {n, 28000000}]]; Select[t, f[ # ] == # && !IntegerQ[ Log[2, # ]] &] (from Robert G. Wilson v Aug 17 2004)
|
|
CROSSREFS
|
Cf. A097214, A097416.
Sequence in context: A124852 A097416 A076373 this_sequence A126397 A001488 A009540
Adjacent sequences: A097212 A097213 A097214 this_sequence A097216 A097217 A097218
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Matthew Vandermast (ghodges14(AT)comcast.net), Aug 12 2004
|
|
EXTENSIONS
|
More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 18 2004
|
|
|
Search completed in 0.002 seconds
|
