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 A116337 #7 Jul 17 2021 01:44:44 %S A116337 8217108,8030443878983905982, %T A116337 43467818511541680701794365325328847002052, %U A116337 56532181488458319298205634674671152997945 %N A116337 Numbers k such that k*(k+4) gives the concatenation of two numbers m and m+7. %e A116337 8217108 * 8217112 = 6752089//6752096, where // denotes concatenation. %Y A116337 Cf. A116173, A116323, A116336, A116338, A116350. %Y A116337 Cf. A116304, A116257. %K A116337 nonn,base %O A116337 1,1 %A A116337 _Giovanni Resta_, Feb 06 2006