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 A116141 #8 Jul 20 2021 23:44:39 %S A116141 4,5303944,6677714,2070936216988528558,2969428172738875624, %T A116141 6685545813563350444,8013829604553736451395958429212, %U A116141 9724110515510343256451213152382 %N A116141 Numbers k such that k concatenated with k-2 gives the product of two numbers which differ by 1. %e A116141 6677714//6677712 = 8171728 * 8171729, where // denotes %e A116141 concatenation. %Y A116141 Cf. A116134, A054214, A116154, A116272. %K A116141 nonn,base %O A116141 1,1 %A A116141 _Giovanni Resta_, Feb 06 2006