|
Search: id:A068317
|
|
|
| A068317 |
|
Numbers n such that n*tau(n) > omega(n)*prime(n) where tau(n) is the number of divisors of n and omega(n) the number of distinct prime factors of n. |
|
+0
1
|
|
| 1, 2, 3, 4, 8, 9, 16, 24, 27, 32, 36, 48, 64, 72, 96, 108, 128, 144, 160, 180, 192, 216, 240, 256, 288, 320, 324, 360, 384, 400, 432, 480, 504, 512, 540, 576, 600, 640, 648, 672, 720, 756, 768, 792, 800, 840, 864, 896, 900, 936, 960, 972, 1000, 1008, 1024
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
There are very few odd terms in the sequence ( 1,3,9,27,30375,33075,....) (PARI) for(n=1,1000, if(numdiv(n)*n>omega(n)*prime(n),print1(n,",")))
|
|
CROSSREFS
|
Sequence in context: A078829 A045583 A045608 this_sequence A074311 A076382 A006899
Adjacent sequences: A068314 A068315 A068316 this_sequence A068318 A068319 A068320
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 26 2002
|
|
|
Search completed in 0.002 seconds
|
