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 A116116 #8 Jul 21 2021 22:47:23 %S A116116 21,30,902406,959721,6040059046,6242406405,9842410005,9900249006, %T A116116 15033519988494,17250863148969,22499666270469,27632040031654, %U A116116 34182546327286,37487353123861,52213551379230,74230108225630 %N A116116 Numbers k such that k concatenated with k-6 gives the product of two numbers which differ by 2. %e A116116 9900249006//9900249000 = 9949999500 * 9949999502, where // denotes concatenation. %Y A116116 Cf. A116102, A116115, A115431, A116121, A116247. %K A116116 nonn,base %O A116116 1,1 %A A116116 _Giovanni Resta_, Feb 06 2006