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 A116171 #8 Jul 20 2021 23:46:59 %S A116171 8,52,63716866,48793687600063875363014809897052, %T A116171 60020753655608135708762056127156,60446518621981165303188950156776, %U A116171 71135436903815748345367595855336,72876856643103028189103298533248 %N A116171 Numbers k such that k concatenated with k+2 gives the product of two numbers which differ by 3. %C A116171 Also numbers k such that k concatenated with k+4 gives the product of two numbers which differ by 1. %e A116171 63716866//63716868 = 79822844 * 79822847, where // denotes concatenation. %e A116171 63716866//63716870 = 79822845 * 79822846. %Y A116171 Cf. A116099, A116170, A116172, A116112, A116302, A116099, A115428, A116314. %K A116171 nonn,base %O A116171 1,1 %A A116171 _Giovanni Resta_, Feb 06 2006 %E A116171 Edited by _N. J. A. Sloane_, Apr 13 2007