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 A116248 #4 Feb 20 2019 14:59:45 %S A116248 7310,8989,32522,67475,76566,4891728,5108269,8528092,71588334, %T A116248 98999899,399659933005,600340066992,723627738225,877712329766, %U A116248 998999998999,3485626998112,3787100274612,6212899725385,6514373001885 %N A116248 n times n+4 gives the concatenation of two numbers m and m-6. %e A116248 98999899 * 98999903 = 98009803//98009797, where // denotes %e A116248 concatenation. %Y A116248 Cf. A115431, A116235, A116247, A116249, A116254. %K A116248 nonn,base %O A116248 1,1 %A A116248 _Giovanni Resta_, Feb 06 2006