%I #5 Oct 19 2017 03:15:00
%S 3,42,333,43431,444234,4343434,44442113,4434333131,43433423421,
%T 444342132443,4444434444114,444344434443444,4444444244242143,
%U 44444344444311111,444444442312244142,44444343333321221114
%N a(n) is the largest base-5 string such that the n-th number coprime to 5 does not divide any substring of a(n).
%e a(3) = 42 (base 5) because the 3rd number coprime to 5 is 3, and 3 does not divide any substring of a(3).
%K nonn,base
%O 2,1
%A _Don Reble_, Feb 20 2006