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 A116094 #6 Jul 15 2021 06:30:21 %S A116094 15,771,939,2099721,2935179,5235841,5424812334857206131, %T A116094 6846608332924813315,1458115445754267551129074204621, %U A116094 3821059872421656136462055529015,5557540612916539470512122318065 %N A116094 Numbers k such that k concatenated with k-9 gives the product of two numbers which differ by 1. %e A116094 5235841//5235832 = 7235911 * 7235912, where // denotes %e A116094 concatenation. %Y A116094 Cf. A116095, A116101, A116225. %K A116094 nonn,base %O A116094 1,1 %A A116094 _Giovanni Resta_, Feb 06 2006