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 A116167 #6 Jul 20 2021 23:46:25 %S A116167 7,493,607,629,757,17927,33247,93869,19467217,31223879,72757727, %T A116167 13454739732766891651472740499,40093333713615672956030023507, %U A116167 48089152118689474641229584727,66424317743191484432891678269 %N A116167 Numbers k such that k concatenated with k+1 gives the product of two numbers which differ by 7. %e A116167 72757727//72757728 = 85298137 * 85298144, where // denotes concatenation. %Y A116167 Cf. A116160, A115428, A116168, A116180, A116298. %K A116167 nonn,base %O A116167 1,1 %A A116167 _Giovanni Resta_, Feb 06 2006