A046470 Even numbers with an odd number of prime factors (counted with multiplicity).

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

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: A290608 A340690 A303900 * A090772 A046525 A235353

Adjacent sequences: A046467 A046468 A046469 * A046471 A046472 A046473

Keyword

nonn

Author

Shyam Sunder Gupta, Feb 16 2002

Status

approved