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3, 4, 7, 8, 11, 12, 15, 16, 17, 18, 19, 20, 23, 24, 27, 28, 29, 30, 31, 32, 35, 36, 39, 40, 43, 44, 47, 48, 51, 52, 55, 56, 57, 58, 59, 60, 63, 64, 67, 68, 69, 70, 71, 72, 75, 76, 79, 80, 83, 84, 87, 88, 91, 92, 95, 96, 97, 98, 99, 100, 103, 104, 107, 108
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OFFSET
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1,1
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COMMENTS
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Conjecture: a(n)/n -> (1+sqrt(5))/2 = golden ratio (A001622).
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LINKS
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EXAMPLE
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As a word, A285501 = 00110011..., in which 1 is in positions 3,4,7,8,11,...
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MATHEMATICA
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s = Nest[Flatten[# /. {0 -> {1, 1}, 1 -> {0, 0, 1, 1}}] &, {0}, 8] (* A285501 *)
Flatten[Position[s, 0]] (* A285502 *)
Flatten[Position[s, 1]] (* A285503 *)
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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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