|
| |
|
|
A036327
|
|
Composite numbers n such that juxtaposition of prime factors of n has length 3.
|
|
2
| |
|
|
8, 12, 18, 20, 22, 26, 27, 28, 30, 33, 34, 38, 39, 42, 45, 46, 50, 51, 55, 57, 58, 62, 63, 65, 69, 70, 74, 75, 77, 82, 85, 86, 87, 91, 93, 94, 95, 98, 105, 106, 111, 115, 118, 119, 122, 123, 125, 129, 133, 134, 141, 142, 145, 146, 147, 155, 158, 159, 161, 166, 175
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| The last term is a(104)=679.
|
|
|
LINKS
| Nathaniel Johnston, Table of n, a(n) for n = 1..104 (full sequence)
|
|
|
MAPLE
| isA036327 := proc(n) local d: d:=ifactors(n)[2]: return `if`(not isprime(n) and add(length(d[j][1])*d[j][2], j=1..nops(d))=3, n, NULL): end: seq(isA036327(n), n=2..999); # Nathaniel Johnston, Jun 22 2011
|
|
|
CROSSREFS
| Cf. A036326-A036334.
Sequence in context: A030752 A091523 A104201 * A051144 A067537 A046339
Adjacent sequences: A036324 A036325 A036326 * A036328 A036329 A036330
|
|
|
KEYWORD
| nonn,base,easy,fini
|
|
|
AUTHOR
| Patrick De Geest (pdg(AT)worldofnumbers.com), Dec 15 1998.
|
| |
|
|
