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A287373 Positions of 0 in A101666. 4
1, 8, 12, 15, 20, 23, 28, 29, 36, 39, 44, 45, 52, 55, 57, 64, 68, 71, 76, 77, 84, 87, 89, 96, 100, 103, 108, 109, 113, 120, 124, 127, 132, 135, 140, 141, 148, 151, 153, 160, 164, 167, 172, 173, 177, 184, 188, 191, 196, 199, 204, 205, 212, 215, 217, 224, 225 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

4n - a(n) is in {0,1,3} for n >= 1.  The first 20 numbers 4n - a(n) are 3, 0, 0, 1, 0, 1, 0, 3, 0, 1, 0, 3, 0, 1, 3, 0, 0, 1, 0, 3.  In the sequence (4n - a(n)), let r be the sequence of positions occupied by 3; and likewise, s for 0 and t for 1; then r = A287373, s = A287374, and t = A287375.

LINKS

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

MATHEMATICA

s = Nest[Flatten[# /. {0 -> {0, 1}, 1 -> {1, 2}, 2 -> {1, 0}}] &, {0}, 12] (* A101666 *)

Flatten[Position[s, 0]]  (* A287373 *)

Flatten[Position[s, 1]]  (* A287374 *)

Flatten[Position[s, 2]]  (* A287375 *)

CROSSREFS

Cf. A287372, A287374, A287375.

Sequence in context: A180690 A194592 A175132 * A031034 A152758 A160258

Adjacent sequences:  A287370 A287371 A287372 * A287374 A287375 A287376

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, May 25 2017

STATUS

approved

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Last modified April 19 06:59 EDT 2019. Contains 322237 sequences. (Running on oeis4.)