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 A116181 #6 Jul 20 2021 23:47:56 %S A116181 57,1062,4545,9517,65040816823705919148274557212824575357, %T A116181 73854453524198329292125744115286819630, %U A116181 78444109191135472482770868099397646205 %N A116181 Numbers k such that k concatenated with k+3 gives the product of two numbers which differ by 8. %e A116181 9517//9520 = 9752 * 9760, where // denotes concatenation. %Y A116181 Cf. A116174, A116180, A116182, A116189, A116312. %K A116181 nonn,base %O A116181 1,1 %A A116181 _Giovanni Resta_, Feb 06 2006