A167175 Numbers with a nonprime number of prime divisors (counted with multiplicity).

1, 2, 3, 5, 7, 11, 13, 16, 17, 19, 23, 24, 29, 31, 36, 37, 40, 41, 43, 47, 53, 54, 56, 59, 60, 61, 64, 67, 71, 73, 79, 81, 83, 84, 88, 89, 90, 96, 97, 100, 101, 103, 104, 107, 109, 113, 126, 127, 131, 132, 135, 136, 137, 139, 140, 144, 149, 150, 151, 152, 156, 157, 160

Offset

1,2

Links

G. C. Greubel, Table of n, a(n) for n = 1..1000

Mathematica

Select[Range[200], !PrimeQ[PrimeOmega[#]]&] (* Harvey P. Dale, Apr 14 2013 *)

Prog

(PARI) is(n)=!isprime(bigomega(n)) \\ Charles R Greathouse IV, Jun 19 2016

Crossrefs

Cf. A001222, A063989, A141468.

Sequence in context: A117093 A062063 A211338 * A026478 A211485 A154893

Adjacent sequences: A167172 A167173 A167174 * A167176 A167177 A167178

Keyword

nonn

Author

Juri-Stepan Gerasimov, Oct 29 2009

Extensions

86 replaced by 96, 112 and 124 removed, 147 replaced by 144, 153 removed - R. J. Mathar, Apr 14 2010

Status

approved