



2, 5, 8, 10, 13, 16, 18, 21, 24, 27, 30, 32, 35, 38, 40, 43, 46, 49, 52, 54, 57, 60, 62, 65, 68, 70, 73, 76, 78, 81, 84, 87, 90, 92, 95, 98, 100, 103, 106, 109, 112, 114, 117, 120, 122, 125, 128, 130, 133, 136, 138, 141, 144, 147, 150, 152, 155, 158, 160
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OFFSET

1,1


COMMENTS

Conjecture: 1 < n*r  a(n) < 2 for n >= 1, where r = 1 + sqrt(3).


LINKS



EXAMPLE

As a word, A284772 = 010010..., in which 1 is in positions 2,5,...


MATHEMATICA

s = Nest[Flatten[# /. {0 > {0, 1}, 1 > {0, 0, 1, 0}}] &, {0}, 6] (* A284772 *)
Flatten[Position[s, 0]] (* A284773 *)
Flatten[Position[s, 1]] (* A284774 *)


CROSSREFS



KEYWORD

nonn,easy


AUTHOR



STATUS

approved



