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2, 3, 8, 9, 12, 13, 16, 17, 20, 21, 26, 27, 30, 31, 36, 37, 40, 41, 46, 47, 50, 51, 56, 57, 60, 61, 64, 65, 68, 69, 74, 75, 78, 79, 84, 85, 88, 89, 92, 93, 96, 97, 102, 103, 106, 107, 112, 113, 116, 117, 120, 121, 124, 125, 130, 131, 134, 135, 140, 141, 144
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OFFSET
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1,1
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COMMENTS
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Conjecture: -3 < n*r - a(n) < 4 for n >= 1, where r = (3+sqrt(3))/2.
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LINKS
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EXAMPLE
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The first 10 letters of the word in A284369 are 1001111001, in which the positions of 0 are 2,3,8,9.
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MATHEMATICA
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s = Nest[Flatten[# /. {0 -> {1}, 1 -> {1, 0, 0, 1}}] &, {0}, 9]; (* A284369 *)
Flatten[Position[s, 0]]; (* A284370 *)
Flatten[Position[s, 1]]; (* A284371 *)
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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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