OFFSET
1,1
COMMENTS
Complement of A107342 in the class of semiprimes.
This is to semiprimes A001358 as A034844 (Primes with nonprime digits) is to primes A000040. [Jonathan Vos Post, Jul 15 2010]
FORMULA
MATHEMATICA
cnd[n_]:=Plus@@Last/@FactorInteger[n]==2&&Union[FreeQ[IntegerDigits[n], # ]&/@{4, 6, 9}]=={True}; Select[Range[600], cnd[ # ]&]
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Zak Seidov, Jun 13 2005
STATUS
approved