OFFSET
1,1
COMMENTS
This will also contain all odd primes.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
EXAMPLE
25 is a member of sequence because 25 is odd and number of distinct prime factors of 25 i.e. 1 is also odd.
MATHEMATICA
Select[Range[300], And@@OddQ[{#, PrimeNu[#]}]&] (* Harvey P. Dale, Feb 19 2014 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Shyam Sunder Gupta, Oct 14 2004
STATUS
approved