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%I #8 Oct 21 2014 09:48:01
%S 4,6,9,44,46,49,64,66,69,94,96,99,444,446,449,464,466,469,494,496,499,
%T 644,646,649,664,666,669,694,696,699,944,946,949,964,966,969,994,996,
%U 999,4444,4446,4449,4464,4466,4469,4494,4496,4499,4644,4646,4649,4664
%N Numbers with semiprime digits (digits 4, 6, 9 only).
%t Select[Range[5000],Union[Pick[DigitCount[#],{1,1,1,0,1,0,1,1,0,1},1]] == {0}&] (* _Harvey P. Dale_, Oct 21 2011 *)
%t Flatten[Table[FromDigits/@Tuples[{4,6,9},n],{n,4}]] (* _Harvey P. Dale_, Oct 21 2014 *)
%Y Cf. A107666 (primes in this sequence), A001358 (semiprimes), A029581 (all digits are composite).
%Y Cf. A107342, A111494, A111496, A111697.
%K base,nonn
%O 1,1
%A _Rick L. Shepherd_, May 19 2005
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