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A046470 Even numbers with an odd number of prime factors (counted with multiplicity). 2
2, 8, 12, 18, 20, 28, 30, 32, 42, 44, 48, 50, 52, 66, 68, 70, 72, 76, 78, 80, 92, 98, 102, 108, 110, 112, 114, 116, 120, 124, 128, 130, 138, 148, 154, 162, 164, 168, 170, 172, 174, 176, 180, 182, 186, 188, 190, 192, 200, 208, 212, 222, 230, 236, 238, 242, 244 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..57.

EXAMPLE

a(2)=8, which is even with odd number of prime factors i.e. 3.

MATHEMATICA

Select[Range[2, 244, 2], OddQ[PrimeOmega[#]] &] (* Jayanta Basu, Jun 26 2013 *)

CROSSREFS

Cf. A046337.

Sequence in context: A067884 A005880 A290608 * A090772 A046525 A235353

Adjacent sequences:  A046467 A046468 A046469 * A046471 A046472 A046473

KEYWORD

nonn

AUTHOR

Shyam Sunder Gupta, Feb 16 2002

STATUS

approved

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Last modified September 23 17:50 EDT 2017. Contains 292363 sequences.