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 A116131 #6 Jul 20 2021 23:43:37 %S A116131 20,31,14564,38239,69919,120395,426436,902596,7478020,9090220, %T A116131 6671332084,8114264059,8482227259,9900250996,2244338786836, %U A116131 2490577152964,2509440638591,2769448208395,7012067592220 %N A116131 Numbers k such that k concatenated with k-4 gives the product of two numbers which differ by 6. %e A116131 9900250996//9900250992 = 9950000498 * 9950000504, where // denotes concatenation. %Y A116131 Cf. A116125, A116130, A116132, A115429, A116262. %K A116131 nonn,base %O A116131 1,1 %A A116131 _Giovanni Resta_, Feb 06 2006