



1, 2, 3, 4, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17, 18, 20, 21, 22, 23, 24, 26, 27, 28, 29, 30, 31, 32, 34, 35, 36, 37, 38, 40, 41, 42, 43, 44, 46, 47, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 60, 61, 62, 63, 64, 65, 66, 68, 69, 70, 71, 72, 74, 75, 76, 77, 78
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OFFSET

1,2


COMMENTS

a(n)  a(n1) is in {1,2,3} for n >= 2, and a(n)/n > 4  sqrt(8).


LINKS

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


EXAMPLE

As a word, A286688 = 00001000001000000010000010..., in which 0 is in positions 1,2,3,4,6,7,...


MATHEMATICA

s = Nest[Flatten[# /. {0 > {0, 0, 1}, 1 > {0}}] &, {0}, 6] (* A171588 *)
w = StringJoin[Map[ToString, s]]
w1 = StringReplace[w, {"0" > "00", "1">"10"}]
st = ToCharacterCode[w1]  48 ; (* A286688 *)
Flatten[Position[st, 0]]; (* A286689 *)
Flatten[Position[st, 1]]; (* A286690 *)


CROSSREFS

Cf. A171588, A286688, A286690.
Sequence in context: A039223 A028392 A175970 * A278373 A183293 A184524
Adjacent sequences: A286686 A286687 A286688 * A286690 A286691 A286692


KEYWORD

nonn,easy


AUTHOR

Clark Kimberling, May 13 2017


STATUS

approved



