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 A116276 #14 Jul 18 2021 06:47:42 %S A116276 70,79822843,69852478553064869297984899963805, %T A116276 77473062193002372448027740546437,77747359197583788609974143907617, %U A116276 84341826458653210947638195982113,85367942837521291760016984490249 %N A116276 Numbers k such that k*(k+5) gives the concatenation of two numbers m and m-2. %e A116276 79822843 * 79822848 = 63716866//63716864, where // denotes concatenation. %Y A116276 Cf. A028557, A116107, A116268, A116275, A116277, A116281. %K A116276 nonn,base %O A116276 1,1 %A A116276 _Giovanni Resta_, Feb 06 2006