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 A220289 #10 Sep 27 2014 04:58:08 %S A220289 1010100,2200100,12321230,324322330,43040303150,5411665056000, %T A220289 33254100107730,210324811482600,977731833235239280 %N A220289 Smallest composite integer in base n which remains composite after altering any one or two digits. %C A220289 Unlike A133219, changing the most significant digit to 0 is disallowed. %H A220289 Witold Jarnicki and Maciej Zenczykowski, <a href="http://arXiv.org/abs/0709.3361">On a property of the number 977731833235239280</a>, arXiv:0709.3361 [math.NT], 2007. %e A220289 Expressed in base 10, the terms from n=2 to 9 are: 84, 1953, 28268, 1401590, 273241578, 77478704205, 1878528135128, 48398467146642. - edited by _Michel Marcus_, Sep 27 2014 %Y A220289 Cf. A133219. %K A220289 base,nonn,more %O A220289 2,1 %A A220289 _Michel Marcus_, Dec 09 2012 %E A220289 Typo for a(10) corrected by _Michel Marcus_, Sep 27 2014