

A287575


Positions of 3 in A287571.


6



2, 7, 9, 16, 20, 22, 27, 29, 35, 37, 44, 46, 49, 56, 58, 63, 65, 72, 74, 79, 82, 87, 89, 96, 100, 102, 107, 109, 115, 117, 124, 126, 132, 134, 139, 141, 147, 149, 156, 158, 161, 168, 170, 175, 178, 183, 185, 192, 195, 197, 204, 206, 209, 216, 218, 223, 226
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OFFSET

1,1


COMMENTS

a(n)  a(n1) is in {1,2,3,4,5,6,7} for n >= 1; also, 4n  a(n) is in {0,1,2,3} for n >= 1. The first 20 numbers 4n  a(n) are 2, 1, 3, 0, 0, 2, 1, 3, 1, 3, 0, 2, 3, 0, 2, 1, 3, 0, 2, 1, with
0 in positions given by A287574,
1 in positions given by A287575,
2 in positions given by A287572,
3 in positions given by A287573.


LINKS

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


MATHEMATICA

s = Nest[Flatten[# /. {0 > {0, 3, 1, 2}, 1 > {3, 1, 2, 0}, 2 > {1, 2, 0, 3}, 3 > {2, 0, 3, 1}}] &, {0}, 9]; (* A287571 *)
Flatten[Position[s, 0]]; (* A287572 *)
Flatten[Position[s, 1]]; (* A287573 *)
Flatten[Position[s, 2]]; (* A287574 *)
Flatten[Position[s, 3]]; (* A287575 *)


CROSSREFS

Cf. A287571, A287572, A287573, A287574.
Sequence in context: A185869 A020894 A165995 * A267212 A022113 A041643
Adjacent sequences: A287572 A287573 A287574 * A287576 A287577 A287578


KEYWORD

nonn,easy


AUTHOR

Clark Kimberling, Jun 01 2017


STATUS

approved



