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 A116190 #6 Jul 19 2021 22:36:08 %S A116190 16,36,12366,42036,64996,1589736168,1921234732,3154856388,3615437032, %T A116190 5939192968,6565302732,1888656611704713276,2251541774559900786, %U A116190 2761459004510103616,3196921199936328628,63080834574071218603723158 %N A116190 Numbers k such that k concatenated with k+4 gives the product of two numbers which differ by 9. %Y A116190 Cf. A116182, A116189, A116197, A116321. %K A116190 nonn,base %O A116190 1,1 %A A116190 _Giovanni Resta_, Feb 06 2006