A287386 Positions of 0 in A287385.

1, 6, 7, 10, 15, 16, 19, 22, 27, 28, 31, 36, 37, 42, 43, 46, 51, 52, 55, 60, 61, 64, 67, 72, 73, 78, 79, 82, 87, 88, 91, 94, 99, 100, 105, 106, 109, 112, 117, 118, 123, 124, 127, 132, 133, 136, 141, 142, 145, 150, 151, 154, 157, 162, 163, 168, 169, 172, 177

Offset

1,2

Comments

a(n) - a(n-1) is in {1,3,5} for n >= 1; also, 3n - a(n) is in {0,2} for n >= 1. The first 20 numbers 3n - a(n) are 2, 0, 2, 2, 0, 2, 2, 2, 0, 2, 2, 0, 2, 0, 2, 2, 0, 2, 2, 0, with 0 in positions given by A287387.

Links

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

Mathematica

s = Nest[Flatten[# /. {0->{0, 1, 2}, 1->{2, 1, 0}, 2->{0, 2, 1}}] &, {0}, 9]; (*A287385*)
Flatten[Position[s, 0]]; (*A287386*)
Flatten[Position[s, 1]]; (*A287387*)
Flatten[Position[s, 2]]; (*A287388*)

Crossrefs

Cf. A287385, A287387, A287388.

Sequence in context: A101972 A102727 A315831 * A287803 A216348 A114949

Adjacent sequences: A287383 A287384 A287385 * A287387 A287388 A287389

Keyword

nonn,easy

Author

Clark Kimberling, May 25 2017

Status

approved