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 A116139 #6 Jul 20 2021 23:44:24 %S A116139 43,20440836,30017751,61336887,52400871197755334426147587, %T A116139 53651708763838760619655612,56652002793835820319625612, %U A116139 57952296063256269823192087,17684775866714240650923831481623 %N A116139 Numbers k such that k concatenated with k-3 gives the product of two numbers which differ by 8. %e A116139 61336887//61336884 = 78317866 * 78317874, where // denotes concatenation. %Y A116139 Cf. A116126, A116205, A116140, A116146, A116270. %K A116139 nonn,base %O A116139 1,1 %A A116139 _Giovanni Resta_, Feb 06 2006