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 A116203 #6 Jul 19 2021 01:18:46 %S A116203 24,26,1014,1196,4280,4646,10512559797957763880,22117246687805424846, %T A116203 24058546574769555806,25959521962351403984,28059292876752476030, %U A116203 45666404019969616806,51120259070514684854,56575813788698035286 %N A116203 Numbers k such that k concatenated with k+6 gives the product of two numbers which differ by 9. %e A116203 4646//4652 = 6812 * 6821, where // denotes concatenation. %Y A116203 Cf. A116197, A116202, A116211, A116334. %K A116203 nonn,base %O A116203 1,1 %A A116203 _Giovanni Resta_, Feb 06 2006