Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #5 Mar 30 2012 18:40:28
%S 10,15,21,22,25,33,35,38,51,55,57,58,77,82,85,87,111,115,118,121,122,
%T 123,133,155,158,177,178,183,185,187,201,202,203,205,213,215,217,218,
%U 221,235,237,253,278,287,301,302,303,305,321,323,327,335,355,358,371
%N Semiprimes with non-semiprimes digits (no digits 4,6,9 in semiprimes).
%C Complement of A107342 in the class of semiprimes.
%C This is to semiprimes A001358 as A034844 (Primes with nonprime digits) is to primes A000040. [_Jonathan Vos Post_, Jul 15 2010]
%F {j in A001358 and j not in A179463}. [_Jonathan Vos Post_, Jul 15 2010]
%t cnd[n_]:=Plus@@Last/@FactorInteger[n]==2&&Union[FreeQ[IntegerDigits[n], # ]&/@{4, 6, 9}]=={True};Select[Range[600], cnd[ # ]&]
%Y Cf. A107342, A137167.
%Y Cf. A107665, A107666, A111494, A111496, A111697, A179336. [_Jonathan Vos Post_, Jul 15 2010]
%K nonn,base
%O 1,1
%A _Zak Seidov_, Jun 13 2005