|
| |
|
|
A014614
|
|
Numbers that are products of 5 primes (or 5-almost primes, a generalization of semiprimes).
|
|
72
| |
|
|
32, 48, 72, 80, 108, 112, 120, 162, 168, 176, 180, 200, 208, 243, 252, 264, 270, 272, 280, 300, 304, 312, 368, 378, 392, 396, 405, 408, 420, 440, 450, 456, 464, 468, 496, 500, 520, 552, 567, 588, 592, 594, 612, 616, 630, 656, 660, 675, 680, 684, 688, 696
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| Divisible by exactly 5 prime powers (not including 1).
|
|
|
LINKS
| T. D. Noe, Table of n, a(n) for n=1..10000
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
|
|
|
FORMULA
| Product p_i^e_i with Sum e_i = 5.
|
|
|
MATHEMATICA
| Select[Range[300], Plus @@ Last /@ FactorInteger[ # ] == 5 &] - Vladimir Orlovsky, Apr 23 2008
|
|
|
CROSSREFS
| Cf. A046304, A114453 (number of 5-almost primes <= 10^n).
Sequences listing r-almost primes; that is the n such that A001222(n) = r: A000040 (r = 1), A001358 (r = 2), A014612 (r = 3), A014613 (r = 4), this sequence (r = 5), A046306 (r = 6), A046308 (r = 7), A046310 (r = 8), A046312 (r = 9), A046314 (r = 10), A069272 (r = 11), A069273 (r = 12), A069274 (r = 13), A069275 (r = 14), A069276 (r = 15), A069277 (r = 16), A069278 (r = 17), A069279 (r = 18), A069280 (r = 19), A069281 (r = 20). - Jason Kimberley, Oct 02 2011
Sequence in context: A090052 A163285 A036329 * A046371 A175162 A039379
Adjacent sequences: A014611 A014612 A014613 * A014615 A014616 A014617
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Eric Weisstein (eric(AT)weisstein.com)
|
|
|
EXTENSIONS
| More terms from Scott Lindhurst (ScottL(AT)alumni.princeton.edu) and Patrick De Geest, Jun 15 1998 (pdg(AT)worldofnumbers.com).
|
| |
|
|
