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%I #10 Jan 23 2022 13:52:53
%S 0,1,2,3,4,5,6,7,8,9,11,22,33,44,55,66,77,88,99,100,101,121,131,141,
%T 151,161,171,181,191,200,202,212,232,242,252,262,272,282,292,300,303,
%U 313,323,343,353,363,373,383,393,400,404
%N Numbers that cannot be formed by the concatenation of previous terms.
%C Previous terms can appear in any order but can be used at most once. - _Paolo P. Lava_, Mar 04 2010
%e 465 is not in the sequence because 4 U 6 U 5 -> 465;
%e 466 is not in the sequence because 4 U 66 -> 466;
%e 1313 is not in the sequence because 1 U 313 or 131 U 3 -> 1313.
%Y Cf. A141409.
%K nonn,base
%O 1,3
%A _Paolo P. Lava_ and _Giorgio Balzarotti_, Jul 30 2008, Aug 04 2008
%E Corrected by _Paolo P. Lava_, Mar 03 2010
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