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%I #5 Oct 19 2017 03:14:59
%S 1,212,2111,22222,21112,222111222,212121212,22112121,212221222212,
%T 2221221221222,222222222222222,22222222222222222,1121212211122121211,
%U 2121212121212121212,112221112211111121,21111111111111111111
%N a(n) is the largest base-3 string such that the n-th number coprime to 3 does not divide any substring of a(n).
%e a(3) = 212 (base three) because the 3rd number coprime to 4 is 4, and 4 does not divide any substring of a(3).
%K nonn,base
%O 2,2
%A _Don Reble_, Feb 20 2006