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 A116177 #6 Jul 20 2021 23:47:39 %S A116177 205,300,477,732,1920,3157,52896,120085,427020,8264460,88581312, %T A116177 112000885,112917765,143075580,152863360,193537077,233788192, %U A116177 266755221,313680096,370908477,386568925,440852992,442670220 %N A116177 Numbers k such that k concatenated with k+3 gives the product of two numbers which differ by 2. %Y A116177 Cf. A115426, A116099, A116112, A115428, A116308. %K A116177 nonn,base %O A116177 1,1 %A A116177 _Giovanni Resta_, Feb 06 2006