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 A116118 #8 Jul 21 2021 22:47:36 %S A116118 10,12,100,102,132,406,510,852,1000,1002,7930,10000,10002,66942, %T A116118 100000,100002,113322,440056,1000000,1000002,5289256,10000000, %U A116118 10000002,58477510,100000000,100000002,111333222,164378892,183673470 %N A116118 Numbers k such that k concatenated with k-6 gives the product of two numbers which differ by 5. %e A116118 1000000000//999999994 = 999999998 * 1000000003, where // denotes concatenation. %Y A116118 Cf. A116105, A115431, A116119, A116124, A116249. %K A116118 nonn,base %O A116118 1,1 %A A116118 _Giovanni Resta_, Feb 06 2006