|
| |
|
|
A075819
|
|
Even squarefree numbers with exactly 3 prime factors.
|
|
4
| |
|
|
30, 42, 66, 70, 78, 102, 110, 114, 130, 138, 154, 170, 174, 182, 186, 190, 222, 230, 238, 246, 258, 266, 282, 286, 290, 310, 318, 322, 354, 366, 370, 374, 402, 406, 410, 418, 426, 430, 434, 438, 442, 470, 474, 494, 498, 506, 518, 530, 534, 574, 582, 590
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| This sequence first differs from A053858 at 2310=2*3*5*7*11, which is in A053858 but not in this sequence.
|
|
|
EXAMPLE
| 30=2*3*5 and 42=2*3*7 are even, squarefree and have 3 prime factors.
|
|
|
MAPLE
| ts_3_sod := proc(n); if (numtheory[bigomega](n)=3 and numtheory[mobius](n)=-1 and type(n, even)='true') then RETURN(n); fi end: a3sod := [seq(ts_3_sod(i), i=1..2500)]: a3sod;
|
|
|
CROSSREFS
| Cf. A053858.
Sequence in context: A007304 A160350 A053858 * A034683 A087248 A189759
Adjacent sequences: A075816 A075817 A075818 * A075820 A075821 A075822
|
|
|
KEYWORD
| easy,nonn
|
|
|
AUTHOR
| Jani Melik (jani_melik(AT)hotmail.com), Oct 13 2002
|
|
|
EXTENSIONS
| Edited by Dean Hickerson (dean.hickerson(AT)yahoo.com), Oct 21 2002
|
| |
|
|
