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 A116114 #6 Jul 21 2021 22:47:12 %S A116114 13,493,607,629,757,17927,33247,93869,19467217,31223879,72757727, %T A116114 13454739732766891651472740499,40093333713615672956030023507, %U A116114 48089152118689474641229584727,66424317743191484432891678269 %N A116114 Numbers k such that k concatenated with k-7 gives the product of two numbers which differ by 9. %Y A116114 Cf. A116109, A116113, A116180, A116245. %K A116114 nonn,base %O A116114 1,1 %A A116114 _Giovanni Resta_, Feb 06 2006