This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A107665 #8 Oct 21 2014 09:48:01
%S A107665 4,6,9,44,46,49,64,66,69,94,96,99,444,446,449,464,466,469,494,496,499,
%T A107665 644,646,649,664,666,669,694,696,699,944,946,949,964,966,969,994,996,
%U A107665 999,4444,4446,4449,4464,4466,4469,4494,4496,4499,4644,4646,4649,4664
%N A107665 Numbers with semiprime digits (digits 4, 6, 9 only).
%t A107665 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 A107665 Flatten[Table[FromDigits/@Tuples[{4,6,9},n],{n,4}]] (* _Harvey P. Dale_, Oct 21 2014 *)
%Y A107665 Cf. A107666 (primes in this sequence), A001358 (semiprimes), A029581 (all digits are composite).
%Y A107665 Cf. A107342, A111494, A111496, A111697.
%K A107665 base,nonn
%O A107665 1,1
%A A107665 _Rick L. Shepherd_, May 19 2005