



1, 2, 4, 5, 6, 8, 9, 10, 11, 12, 14, 15, 16, 18, 19, 20, 22, 23, 24, 25, 26, 28, 29, 30, 32, 33, 34, 36, 37, 38, 40, 41, 42, 44, 45, 46, 47, 48, 50, 51, 52, 54, 55, 56, 58, 59, 60, 61, 62, 64, 65, 66, 68, 69, 70, 72, 73, 74, 75, 76, 78, 79, 80, 82, 83, 84
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OFFSET

1,2


COMMENTS

Conjecture: 1 < n*r  a(n) < 4 for n>=1, where r = (1 + sqrt(17))/4.


LINKS

Clark Kimberling, Table of n, a(n) for n = 1..10000


EXAMPLE

As a word, A285668 = 11011101..., in which 1 is in positions 1,2,4,5,6,8,...


MATHEMATICA

s = Nest[Flatten[# /. {0 > {1, 1}, 1 > {1, 1, 0, 1}}] &, {0}, 9] (* A285668 *)
Flatten[Position[s, 0]] (* A285669 *)
Flatten[Position[s, 1]] (* A285670 *)


CROSSREFS

Cf. A285668, A285669.
Sequence in context: A226946 A288708 A039138 * A030124 A064318 A286924
Adjacent sequences: A285667 A285668 A285669 * A285671 A285672 A285673


KEYWORD

nonn,easy


AUTHOR

Clark Kimberling, May 02 2017


STATUS

approved



