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 A116200 #7 Jul 19 2021 01:18:29 %S A116200 210,294,5880,52888,127044,414180,8264470,12456750,41868508,112670544, %T A116200 441341880,468144040,669421494,702338994,715976338,750005718, %U A116200 960645294,1491030294,3768258010,4783279044,8505429358,17105045530 %N A116200 Numbers k such that k concatenated with k+6 gives the product of two numbers which differ by 5. %Y A116200 Cf. A116193, A116172, A116147, A116207, A116331. %K A116200 nonn,base %O A116200 1,1 %A A116200 _Giovanni Resta_, Feb 06 2006