A288605 - OEIS

A288605

Position of first appearance of each integer in A088568 (number of 1's minus number of 2's in first n terms of A000002).

0, 1, 3, 12, 32, 93, 257, 378, 471, 798, 825, 858, 1127, 1398, 1497, 1524, 1533, 6352, 6969, 7176, 7269, 7566, 7971, 20338, 20371, 21982, 22009, 25638, 25665, 25692, 27969, 39184, 39211, 42398, 43129, 43150, 48637, 48730, 48757, 49014, 49041, 49068, 49095, 49864

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OFFSET

1,3

COMMENTS

For the definition of this sequence we assume A088568(0) = 0.

LINKS

Table of n, a(n) for n=1..44.

EXAMPLE

A088568(12) = -2 is the first appearance of -2 in A088568, so 12 belongs to the sequence.

A088568(32) = 2 is the first appearance of 2, so 32 belongs to the sequence.

MATHEMATICA

Map[First, Values@ #] - 1 &@ PositionIndex@ Prepend[#, 0] &@ MapIndexed[3 First@ #2 - 2 #1 &, Accumulate@ Prepend[Nest[Flatten[Partition[#, 2] /. {{2, 2} -> {2, 2, 1, 1}, {2, 1} -> {2, 2, 1}, {1, 2} -> {2, 1, 1}, {1, 1} -> {2, 1}}] &, {2, 2}, 25], 1]] (* Michael De Vlieger, Jun 12 2017, after Birkas Gyorgy at A000002 *)

CROSSREFS

Cf. A000002, A010120, A088568, A187831.

Sequence in context: A037236 A309693 A365738 * A268768 A174963 A054602

Adjacent sequences: A288602 A288603 A288604 * A288606 A288607 A288608

KEYWORD

nonn

AUTHOR

Gus Wiseman, Jun 11 2017

STATUS

approved