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 A046442 #20 Jul 29 2022 05:55:46
%S A046442 22,26,33,34,38,39,46,51,55,57,58,62,65,69,74,77,82,85,86,87,91,93,94,
%T A046442 95,106,111,115,118,119,122,123,129,133,134,141,142,145,146,155,158,
%U A046442 159,161,166,177,178,183,185,194,201,202,203,205,206,213,214,215,217
%N A046442 Semiprimes whose two prime factors are distinct in length.
%C A046442 Semiprimes (A001358) that are not brilliant numbers (A078972). - _Bernard Schott_, Jul 29 2022
%e A046442 203 because 203 = 7 * 29, which have 1 and 2 digits, respectively.
%t A046442 Take[Union[Times@@@Select[Subsets[Prime[Range[50]],{2}],IntegerLength[#[[1]]]!=IntegerLength[#[[2]]]&]],60] (* _Harvey P. Dale_, Dec 29 2010 *)
%Y A046442 Equals A001358 \ A078972.
%K A046442 nonn,base
%O A046442 1,1
%A A046442 _Patrick De Geest_, Jul 15 1998