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 A116223 #7 Jul 18 2021 02:50:04 %S A116223 136,399,600,744,8184,66951,134199,401536,5289264,12456744,41868519, %T A116223 113342199,115655064,142598664,160143051,206611575,227626176, %U A116223 273422475,297520656,359785504,387353899,435493131,440015536 %N A116223 Numbers k such that k concatenated with k+9 gives the product of two numbers which differ by 8. %Y A116223 Cf. A116210, A116169, A116224, A116354. %K A116223 nonn,base %O A116223 1,1 %A A116223 _Giovanni Resta_, Feb 06 2006