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%I #5 Jan 04 2013 17:59:49
%S 1,2,3,4,6,9,11,15,18,27,29,30,32,33,35,42,45,54,60,81,83,86,87,89,92,
%T 95,96,98,99,101,104,105,107,123,126,135,141,153,162,243,245,248,249,
%U 251,252,254,257,258,260,261,263,266,267,269,275,276,278,285,287,288
%N Base 3 "Punctual Bird" numbers: write the natural numbers, base 3, in a string 12101112202122100101102... Sequence gives numbers which do not occur in the string ahead of their natural place.
%e a(5)=6 because 6 (20, base 3) is the fifth number that appears first in its "natural" place in the string of concatenated base-3 numbers.
%Y Cf. A033307, A117804, A116700, A131881, A132131, A132132, A132133, A132135.
%K nonn,base
%O 1,2
%A _Graeme McRae_, Aug 11 2007
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