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 A116215 #7 Jul 18 2021 02:50:36 %S A116215 92,180,332,486,536,9720,13220,40502,941486,2066120,2975202,77854680, %T A116215 123250136,162423540,243964010,256109750,356387462,421110162, %U A116215 542936282,547361900,587114192,591715970,685172036,734693886 %N A116215 Numbers k such that k concatenated with k+8 gives the product of two numbers which differ by 7. %Y A116215 Cf. A116209, A116168, A116216, A116169, A116346. %K A116215 nonn,base %O A116215 1,1 %A A116215 _Giovanni Resta_, Feb 06 2006