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 A116143 #8 Jul 20 2021 23:44:50 %S A116143 10,100,132,406,510,852,1000,7930,10000,66942,100000,113322,440056, %T A116143 1000000,5289256,10000000,58477510,100000000,111333222,164378892, %U A116143 183673470,200444410,206611570,224376732,277008310,297520662 %N A116143 Numbers k such that k concatenated with k-2 gives the product of two numbers which differ by 3. %Y A116143 Cf. A116128, A054214, A115426, A116149, A116274. %K A116143 nonn,base %O A116143 1,1 %A A116143 _Giovanni Resta_, Feb 06 2006