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 A116158 #6 Jul 20 2021 23:45:45 %S A116158 6,96,150,186,324,376,666,996,2046,3000,9996,82650,99996,100384, %T A116158 466716,999996,1322316,4049584,9999996,67820074,99999996,110003884, %U A116158 135734074,156502836,196043286,213017754,238849000,261405396 %N A116158 Numbers k such that k concatenated with itself gives the product of two numbers which differ by 5. %Y A116158 Cf. A116112, A116125, A116159, A116172, A116289. %K A116158 nonn,base %O A116158 1,1 %A A116158 _Giovanni Resta_, Feb 06 2006