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A046337 Odd numbers with an even number of prime factors (counted with multiplicity). 7
1, 9, 15, 21, 25, 33, 35, 39, 49, 51, 55, 57, 65, 69, 77, 81, 85, 87, 91, 93, 95, 111, 115, 119, 121, 123, 129, 133, 135, 141, 143, 145, 155, 159, 161, 169, 177, 183, 185, 187, 189, 201, 203, 205, 209, 213, 215, 217, 219, 221, 225, 235, 237, 247, 249, 253, 259 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

John Cerkan, Table of n, a(n) for n = 1..10000

MATHEMATICA

Select[Range[1, 301, 2], EvenQ[PrimeOmega[#]]&] (* Harvey P. Dale, Jul 25 2011 *)

PROG

(PARI) lista(nn) = {forstep(n=1, nn, 2, if (bigomega(n) % 2 == 0, print1(n, ", "))); } \\ Michel Marcus, Jul 04 2015

CROSSREFS

Cf. A028260, A046338.

Sequence in context: A046350 A225438 A175076 * A046315 A046372 A025045

Adjacent sequences:  A046334 A046335 A046336 * A046338 A046339 A046340

KEYWORD

nonn

AUTHOR

Patrick De Geest, Jun 15 1998

STATUS

approved

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Last modified March 20 13:18 EDT 2019. Contains 321345 sequences. (Running on oeis4.)