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 A116315 #7 Jul 17 2021 01:44:25 %S A116315 3,6,44,55,38162,61837,83617,346979,653020,950050,8647554,9534264, %T A116315 8167822282,9007920991,9209900791,9950000500,4737445289220, %U A116315 4990568257186,5009431742813,5262554710779,8373808925584 %N A116315 Numbers k such that k*(k+2) gives the concatenation of two numbers m and m+4. %Y A116315 Cf. A115428, A116308, A116314, A116316, A116335. %K A116315 nonn,base %O A116315 1,1 %A A116315 _Giovanni Resta_, Feb 06 2006