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 A036326 #6 Oct 10 2019 00:19:07 %S A036326 4,6,9,10,14,15,21,25,35,49 %N A036326 Composite numbers n such that juxtaposition of prime factors of n has length 2. %C A036326 There are exactly 10 such numbers. %Y A036326 Cf. A036327-A036334, A046368. %K A036326 nonn,base,fini,full %O A036326 1,1 %A A036326 _Patrick De Geest_, Dec 15 1998