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A288605
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Position of first appearance of each integer in A088568 (number of 1's minus number of 2's in first n terms of A000002).
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11
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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
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1,3
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COMMENTS
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For the definition of this sequence we assume A088568(0) = 0.
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LINKS
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EXAMPLE
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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.
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MATHEMATICA
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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 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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