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3, 5, 9, 11, 13, 15, 19, 21, 25, 27, 29, 31, 35, 37, 41, 43, 47, 49, 53, 55, 57, 59, 63, 65, 69, 71, 73, 75, 79, 81, 85, 87, 89, 91, 95, 97, 101, 103, 105, 107, 111, 113, 117, 119, 123, 125, 129, 131, 133, 135, 139, 141, 145, 147, 149, 151, 155, 157, 161
(list;
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OFFSET
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1,1
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COMMENTS
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Conjecture: -1 < n*r - a(n) < 1 for n>=1, where r = 1 + sqrt(3).
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LINKS
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Clark Kimberling, Table of n, a(n) for n = 1..10000
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EXAMPLE
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As a word, A285139 = 001010..., in which 1 is in positions 3,5,9,11,,...
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MATHEMATICA
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s = Nest[Flatten[# /. {0 -> {1, 0}, 1 -> {0, 0, 1, 0}}] &, {0}, 12]; (* A285139 *)
Flatten[Position[s, 0]]; (* A285140 *)
Flatten[Position[s, 1]]; (* A285141 *)
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CROSSREFS
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Cf. A285139, A285140, A285142.
Sequence in context: A162699 A325129 A173263 * A329095 A319009 A294427
Adjacent sequences: A285138 A285139 A285140 * A285142 A285143 A285144
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KEYWORD
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nonn,easy
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AUTHOR
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Clark Kimberling, Apr 20 2017
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STATUS
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approved
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