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A132134
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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.
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1
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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, 95, 96, 98, 99, 101, 104, 105, 107, 123, 126, 135, 141, 153, 162, 243, 245, 248, 249, 251, 252, 254, 257, 258, 260, 261, 263, 266, 267, 269, 275, 276, 278, 285, 287, 288
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..60.
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EXAMPLE
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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.
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CROSSREFS
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Cf. A033307, A117804, A116700, A131881, A132131, A132132, A132133, A132135.
Sequence in context: A033069 A022956 A039865 * A027594 A130899 A007210
Adjacent sequences: A132131 A132132 A132133 * A132135 A132136 A132137
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KEYWORD
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nonn,base
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AUTHOR
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Graeme McRae, Aug 11 2007
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STATUS
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approved
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