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 A126687 #9 Jun 24 2013 17:23:37 %S A126687 12,243,2475,28575,428571,4928571,49928571 %N A126687 Maximal value of GCD of 2 distinct n-digit numbers using the same digits. %C A126687 Without the "same digits" constraint, one would get A198971. - _Michel Marcus_, Jun 24 2013 %e A126687 a(3)=243=GCD(729,972). %K A126687 base,nonn %O A126687 2,1 %A A126687 Dmitry Tishkov (DimaTishkov(AT)yandex.ru), Feb 14 2007