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 A188443 #20 Mar 24 2017 00:47:53
%S A188443 25,33,63,66,75,88,191,269,285,309,348,379,399,400,404,413,437,443,
%T A188443 456,548,553,594,616,638,675,684,702,724,764,810,819,823,829,843,897,
%U A188443 901,906,907,1000,1031,1041,1068,1075,1159,1200,1230,1241,1255,1279,1280,1281,1300,1323,1332
%N A188443 Numbers not appearing in A178133, which gives the number of odd semiprimes between consecutive squares.
%t A188443 lst={}; k=0; s=4; Do[If[OddQ[n]&&Last/@FactorInteger[n]=={1,1}, If[n<s^2, k++, AppendTo[lst,k]; k=1;s++]], {n,2*10^8}]; Complement[Range@3000, Union@lst]
%Y A188443 Cf. A178133.
%K A188443 nonn
%O A188443 1,1
%A A188443 _Vladimir Joseph Stephan Orlovsky_, Apr 20 2011