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 A116154 #6 Jul 20 2021 23:45:39 %S A116154 132,406,510,852,7930,66942,113322,440056,5289256,58477510,111333222, %T A116154 164378892,183673470,200444410,206611570,224376732,277008310, %U A116154 297520662,305024040,326530612,353505556,444000556,479289942 %N A116154 Numbers k such that k concatenated with itself gives the product of two numbers which differ by 1. %Y A116154 Cf. A116141, A116136, A116163, A116285. %K A116154 nonn,base %O A116154 1,1 %A A116154 _Giovanni Resta_, Feb 06 2006