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 A063989 Numbers with a prime number of prime divisors (counted with multiplicity). 13
 4, 6, 8, 9, 10, 12, 14, 15, 18, 20, 21, 22, 25, 26, 27, 28, 30, 32, 33, 34, 35, 38, 39, 42, 44, 45, 46, 48, 49, 50, 51, 52, 55, 57, 58, 62, 63, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 82, 85, 86, 87, 91, 92, 93, 94, 95, 98, 99, 102, 105, 106 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Harry J. Smith, Table of n, a(n) for n = 1..1000 MAPLE with(numtheory); a := []: for i from 1 to 300 do if isprime(bigomega(i)) then a := [op(a), i]; fi; od: a; MATHEMATICA Select[Range[200], PrimeQ[PrimeOmega[#]]&] (* Harvey P. Dale, Jul 25 2015 *) PROG (PARI) n=0; for (m=1, 10^9, if (isprime(bigomega(m)), write("b063989.txt", n++, " ", m); if (n==1000, break))) \\ Harry J. Smith, Sep 05 2009 (PARI) is(n)=isprime(bigomega(n)) \\ Charles R Greathouse IV, Sep 18 2015 CROSSREFS Sequence in context: A341321 A063806 A323521 * A168645 A282668 A117097 Adjacent sequences: A063986 A063987 A063988 * A063990 A063991 A063992 KEYWORD nonn AUTHOR N. J. A. Sloane, Sep 18 2001 STATUS approved

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Last modified February 25 13:12 EST 2024. Contains 370330 sequences. (Running on oeis4.)