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A284895 Positions of 1 in A284893; complement of A284894. 4
2, 4, 5, 6, 8, 10, 11, 12, 14, 15, 16, 18, 19, 20, 22, 24, 25, 26, 28, 30, 31, 32, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50, 52, 53, 54, 56, 58, 59, 60, 62, 63, 64, 66, 67, 68, 70, 72, 73, 74, 76, 78, 79, 80, 82, 83, 84, 86, 87, 88, 90, 92, 93, 94 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Conjecture: 0 < a(n) - n*sqrt(2) < 1 for n >= 1.

The conjecture is false, since a(2) - 2*sqrt(2) = 4-2.828... > 1.17.  Presumably the new conjecture is 0 < a(n) - n*sqrt(2) < 2 for n >= 1. - Michel Dekking, Jan 16 2018

This type of behavior typically occurs for Beatty sequences. However, {a(n)} is not a Beatty sequence, since the sequence of first differences {d(n)} of {a(n)} is not Sturmian: in d = 2,1,1,2,2,1,2,1,... there occur 5 words of length 3. One has d = A298231. - Michel Dekking, Jan 16 2018

LINKS

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

EXAMPLE

As a word, A284893 = 010111010..., in which 0 is in positions 1,3,7,9,...

MATHEMATICA

s = Nest[Flatten[# /. {0 -> {0, 1}, 1 -> {0, 1, 1, 1}}] &, {0}, 6] (* A284893 *)

Flatten[Position[s, 0]]  (* A284894 *)

Flatten[Position[s, 1]]  (* A284895 *)

CROSSREFS

Cf. A284893, A284895, A298231.

Sequence in context: A080653 A115836 A176554 * A285354 A050505 A047262

Adjacent sequences:  A284892 A284893 A284894 * A284896 A284897 A284898

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Apr 16 2017

STATUS

approved

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Last modified January 25 08:01 EST 2021. Contains 340416 sequences. (Running on oeis4.)