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 A116128 #6 Jul 20 2021 23:43:10 %S A116128 5303944,6677714,2070936216988528558,2969428172738875624, %T A116128 6685545813563350444,8013829604553736451395958429212, %U A116128 9724110515510343256451213152382 %N A116128 Numbers k such that k concatenated with k-4 gives the product of two numbers which differ by 3. %Y A116128 Cf. A116122, A116129, A116143, A116259. %K A116128 nonn,base %O A116128 1,1 %A A116128 _Giovanni Resta_, Feb 06 2006