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 A116329 #7 Jul 17 2021 01:44:38 %S A116329 387,431,569,613,816,4523,5477,90912,316834,683166,3636366,6363634, %T A116329 82352944,331668334,368421055,395604393,442767756,461538464,488721802, %U A116329 511278198,538461536,557232244,604395607,631578945,668331666 %N A116329 Numbers k such that k*(k+1) gives the concatenation of two numbers m and m+6. %Y A116329 Cf. A116185, A116322, A116330, A116343. %K A116329 nonn,base %O A116329 1,1 %A A116329 _Giovanni Resta_, Feb 06 2006