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 A116189 #6 Jul 19 2021 22:37:41 %S A116189 4,80,10736,45205,58256,481580,810181,5321861,8223821,1342750076, %T A116189 4014039205,6425372269,7089305869,9801001981,1057798964204, %U A116189 4553034666541,5261853984181,8977355147344,9962308611856 %N A116189 Numbers k such that k concatenated with k+4 gives the product of two numbers which differ by 8. %Y A116189 Cf. A116181, A116133, A116190, A116196, A116320. %K A116189 nonn,base %O A116189 1,1 %A A116189 _Giovanni Resta_, Feb 06 2006