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2, 4, 10, 12, 17, 21, 24, 26, 32, 35, 37, 41, 46, 48, 53, 57, 60, 62, 67, 69, 75, 79, 82, 84, 88, 93, 96, 98, 104, 106, 111, 115, 118, 120, 126, 129, 131, 135, 140, 143, 145, 151, 153, 158, 162, 165, 167, 171, 176, 180, 183, 185, 190, 192, 198, 200, 205, 209
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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Conjecture: a(n)/n -> 3.61..., and if m denotes this number, then -1 < m - a(n)/n < 1 for n >= 1.
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LINKS
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MATHEMATICA
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s = {0, 0}; w[0] = StringJoin[Map[ToString, s]];
w[n_] := StringReplace[w[n - 1], {"00" -> "1000", "10" -> "010"}]
Table[w[n], {n, 0, 8}]
st = ToCharacterCode[w[20]] - 48 (* A288223 *)
Flatten[Position[st, 0]] (* A288224 *)
Flatten[Position[st, 1]] (* A288225 *)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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