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 A116130 #10 Jul 20 2021 23:43:29 %S A116130 8,98,590,738,830,998,1080,4508,9998,20660,29754,99998,980300,999998, %T A116130 6694218,9999998,49826988,99999998,117738578,131505858,132231404, %U A116130 176445054,177285320,247979808,252028388,335180054,336337790 %N A116130 Numbers k such that k concatenated with k-4 gives the product of two numbers which differ by 5. %C A116130 Also numbers k such that k concatenated with itself gives the product of two numbers which differ by 3. %e A116130 7531357568//7531357564 = 8678339452 * 8678339457, where // denotes concatenation. %Y A116130 Cf. A116124, A116129, A116131, A116099, A116261, A116163, A116136, A116125, A116287. %K A116130 nonn,base %O A116130 1,1 %A A116130 _Giovanni Resta_, Feb 06 2006 %E A116130 Edited by _N. J. A. Sloane_, Apr 13 2007