



1, 3, 4, 5, 7, 8, 11, 13, 14, 19, 21, 22, 23, 25, 26, 27, 29, 30, 31, 33, 34, 35, 37, 38, 39, 41, 42, 45, 47, 48, 53, 55, 56, 57, 59, 60, 61, 63, 64, 65, 67, 68, 71, 73, 74, 81, 83, 84, 89, 91, 92, 93, 95, 96, 99, 101, 102, 107, 109, 110, 111, 113, 114, 115
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OFFSET

1,2


COMMENTS

Conjecture: a(n)/n > 2.


LINKS



EXAMPLE

As a word, A285530 = 01000100..., in which 0 is in positions 1,3,4,5,7,...


MAPLE

f:= proc(i) if i=0 then (1, 1) else (0, 1, 0, 0) fi end proc:
S:= [0]:
while numboccur(0, S) < 10000 do
S:= map(f, map(f, S))
od:


MATHEMATICA

s = Nest[Flatten[# /. {0 > {1, 1}, 1 > {0, 1, 0, 0}}] &, {0}, 8] (* A285530 *)
Flatten[Position[s, 0]] (* A285531 *)
Flatten[Position[s, 1]] (* A285532 *)


CROSSREFS



KEYWORD

nonn,easy


AUTHOR



STATUS

approved



