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A063745 Even numbers with an even number of prime factors (counted with multiplicity). 1
4, 6, 10, 14, 16, 22, 24, 26, 34, 36, 38, 40, 46, 54, 56, 58, 60, 62, 64, 74, 82, 84, 86, 88, 90, 94, 96, 100, 104, 106, 118, 122, 126, 132, 134, 136, 140, 142, 144, 146, 150, 152, 156, 158, 160, 166, 178, 184, 194, 196, 198, 202, 204, 206, 210, 214, 216, 218, 220 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Harry J. Smith, Table of n, a(n) for n = 1..1000

EXAMPLE

a(2)=6, which is even with even number of prime factors, i.e., 2.

MATHEMATICA

Select[2*Range[200], EvenQ[PrimeOmega[#]]&] (* Harvey P. Dale, Mar 07 2015 *)

PROG

(PARI) { n=0; forstep (m=2, 10^9, 2, if (bigomega(m)%2 == 0, write("b063745.txt", n++, " ", m); if (n==1000, break)) ) } \\ Harry J. Smith, Aug 29 2009

CROSSREFS

Cf. A046337.

Sequence in context: A310583 A298784 A241975 * A123666 A095305 A058917

Adjacent sequences:  A063742 A063743 A063744 * A063746 A063747 A063748

KEYWORD

nonn

AUTHOR

Shyam Sunder Gupta, Feb 16 2002

STATUS

approved

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Last modified April 8 02:27 EDT 2020. Contains 333312 sequences. (Running on oeis4.)