|
Search: id:A120497
|
|
|
| A120497 |
|
Natural numbers n with number of divisors equal to a perfect power. |
|
+0
1
|
|
| 1, 6, 8, 10, 14, 15, 21, 22, 24, 26, 27, 30, 33, 34, 35, 36, 38, 39, 40, 42, 46, 51, 54, 55, 56, 57, 58, 62, 65, 66, 69, 70, 74, 77, 78, 82, 85, 86, 87, 88, 91, 93, 94, 95, 100, 102, 104, 105, 106, 110, 111, 114, 115, 118, 119, 120, 122, 123, 125, 128, 129, 130, 133, 134
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
tau(n) is a square or cube. [From Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Oct 25 2009]
|
|
PROGRAM
|
(PARI) v=[1]; for(n=1, 134, if(ispower(numdiv(n)), v=concat(v, n))); v (Hobson)
|
|
CROSSREFS
|
Cf. A000005. [From Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Oct 25 2009]
Sequence in context: A086822 A048943 A130763 this_sequence A036436 A036455 A007422
Adjacent sequences: A120494 A120495 A120496 this_sequence A120498 A120499 A120500
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Aug 06 2006
|
|
EXTENSIONS
|
More terms from Nick Hobson Nov 29 2006
|
|
|
Search completed in 0.002 seconds
|
