

A287564


Positions of 2 in A287561.


5



2, 8, 9, 15, 17, 23, 26, 32, 36, 37, 43, 46, 51, 54, 60, 61, 68, 69, 75, 78, 83, 86, 92, 93, 98, 104, 105, 111, 113, 119, 122, 128, 129, 135, 138, 144, 148, 149, 155, 158, 163, 166, 172, 173, 178, 184, 185, 191, 195, 198, 204, 205, 210, 216, 217, 223, 225
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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, 0, 3, 1, 3, 1, 2, 0, 0, 3, 1, 2, 1, 2, 0, 3, 0, 3, 1, 2, with


LINKS



MATHEMATICA

s = Nest[Flatten[# /. {0 > {0, 2, 1, 3}, 1 > {2, 1, 3, 0}, 2 > {1, 3, 0, 2}, 3 > {3, 0, 2, 1}}] &, {0}, 9]; (* A287561 *)
Flatten[Position[s, 0]]; (* A287562 *)
Flatten[Position[s, 1]]; (* A287563 *)
Flatten[Position[s, 2]]; (* A287564 *)
Flatten[Position[s, 3]]; (* A287565 *)


CROSSREFS



KEYWORD

nonn,easy


AUTHOR



STATUS

approved



