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2, 4, 7, 9, 13, 15, 18, 20, 25, 27, 30, 32, 36, 38, 41, 43, 49, 51, 54, 56, 60, 62, 65, 67, 72, 74, 77, 79, 83, 85, 88, 90, 97, 99, 102, 104, 108, 110, 113, 115, 120, 122, 125, 127, 131, 133, 136, 138, 144, 146, 149, 151, 155, 157, 160, 162, 167, 169, 172
(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, and 0 < 3 - a(n)/n < 1 for n >= 1.
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LINKS
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FORMULA
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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", "1" -> "10101"}]
Table[w[n], {n, 0, 8}]
st = ToCharacterCode[w[11]] - 48 (* A288932 *)
Flatten[Position[st, 0]] (* A288933 *)
Flatten[Position[st, 1]] (* A288934 *)
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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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