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 A090104 #5 Oct 15 2013 22:32:21
%S A090104 1,1,1,3,3,5,4,5,8,9,10,11,12,13,14,15,16,17,18,18,20,21,22,23,24,25,
%T A090104 24,27,27,29,29,31,32,33,32,35,35,35,34,39,39,41,40,43,44,44,45,45,48,
%U A090104 49,50,51,52,53,54,53,56,57,58,59,60,61,61,62,64,64,66,67,68,69,70,69,72
%N A090104 Decimal value of maximal digit of the n-th primorial when written in base n.
%e A090104 n=11: 11th primorial is 200560490130 in base 10 while it is 7806X193790 written in base 11, so a[11]=10 (denoted by X).
%t A090104 qp[x_] := Prime[x]*qp[x-1]; {qp[0]=1, qp[1]=2};RecursionLimit$=10000; Table[Max[IntegerDigits[qp[j], j]], {j, 2, 100}]
%Y A090104 Cf. A090102.
%K A090104 base,nonn
%O A090104 1,4
%A A090104 _Labos Elemer_, Dec 17 2003