OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
EXAMPLE
MATHEMATICA
Select[Range[4, 200], Not[PrimeQ[#]] && OddQ[PrimePi[#]] &] (* Alonso del Arte, Sep 26 2012 *)
Flatten[Range[First[#]+1, Last[#]-1]&/@Partition[Prime[Range[3, 50]], 2]] (* Harvey P. Dale, Oct 08 2012 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Omar E. Pol, Sep 26 2012
STATUS
approved