|
| |
|
|
A162142
|
|
Numbers that are the cube of a product of two distinct primes.
|
|
6
| |
|
|
216, 1000, 2744, 3375, 9261, 10648, 17576, 35937, 39304, 42875, 54872, 59319, 97336, 132651, 166375, 185193, 195112, 238328, 274625, 328509, 405224, 456533, 551368, 614125, 636056, 658503, 753571, 804357, 830584, 857375, 1191016, 1367631, 1520875, 1643032
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| Subset of A046306, of A000578, and of A007774. [R. J. Mathar, Jun 27 2009]
|
|
|
LINKS
| T. D. Noe, Table of n, a(n) for n = 1..1000
|
|
|
FORMULA
| a(n) = (A006881(n))^3 = A000578(A006881(n)). [R. J. Mathar, Jun 27 2009]
|
|
|
EXAMPLE
| 216=2^3*3^3. 1000=2^3*5^3. 2744=2^3*7^3.
|
|
|
MATHEMATICA
| fQ[n_]:=Last/@FactorInteger[n]=={3, 3}; lst={}; Do[If[fQ[n], AppendTo[lst, n]], {n, 6*9!}]; lst
|
|
|
CROSSREFS
| Sequence in context: A111029 A124581 A177493 * A016863 A033698 A121683
Adjacent sequences: A162139 A162140 A162141 * A162143 A162144 A162145
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Vladimir Orlovsky (4vladimir(AT)gmail.com), Jun 25 2009
|
|
|
EXTENSIONS
| Definition rephrased by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 27 2009
|
| |
|
|
