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 A116152 #6 Jul 20 2021 23:45:26 %S A116152 9,11,45,18281,32769,56891,180689,330539,959481,1850201,3247409, %T A116152 4940219,2425563239,2575561739,6003563495,7245212645,7770160145, %U A116152 4983798265289,5049762270381,5534298528989,5603798594169 %N A116152 Numbers k such that k concatenated with k-1 gives the product of two numbers which differ by 7. %Y A116152 Cf. A116205, A115429, A116153, A116160, A116283. %K A116152 nonn,base %O A116152 1,1 %A A116152 _Giovanni Resta_, Feb 06 2006