A287375 - OEIS

%I #4 May 25 2017 13:14:44

%S 4,6,10,14,18,22,26,32,34,38,42,48,50,54,60,62,66,70,74,80,82,86,92,

%T 94,98,102,106,112,116,118,122,126,130,134,138,144,146,150,156,158,

%U 162,166,170,176,180,182,186,190,194,198,202,208,210,214,220,222,228

%N Positions of 2 in A101666.

%C 4n - a(n) is in {0,2} for n >= 1.  The first 20 numbers 4n - a(n) are 0, 2, 2, 2, 2, 2, 2, 0, 2, 2, 2, 0, 2, 2, 0, 2, 2, 2, 2, 0.

%H Clark Kimberling, <a href="/A287375/b287375.txt">Table of n, a(n) for n = 1..10000</a>

%F a(n) = 2*A287374(n) for n >= 1.

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

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

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

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

%Y Cf. A287372, A287373, A287374.

%K nonn,easy

%O 1,1

%A _Clark Kimberling_, May 25 2017