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`%I #5 May 17 2017 11:33:55
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`%S 1,1,0,1,1,0,0,1,0,1,1,0,1,1,0,0,1,0,1,1,0,1,1,0,1,1,0,0,1,0,1,1,0,1,
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`%T 1,0,0,1,0,1,1,0,1,1,0,1,1,0,0,1,0,1,1,0,1,1,0,0,1,0,1,1,0,1,1,0,0,1,
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`%U 0,1,1,0,1,1,0,1,1,0,0,1,0,1,1,0,1,1
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`%N {0->110, 1->010}-transform of the Pell word, A171588.
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`%C A171588 = 001001000100100010010010001001..., and replacing each 0 by 110 and each 1 by 010 gives 1101100101101100101101101100101..., in which the positions of 0 are given by A286802, and of 1, by A286803.
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`%H Clark Kimberling, <a href="/A286801/b286801.txt">Table of n, a(n) for n = 1..10000</a>
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`%t s = Nest[Flatten[# /. {0 -> {0, 0, 1}, 1 -> {0}}] &, {0}, 16]; (* Pell word, A171588 *)
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`%t w = StringJoin[Map[ToString, s]];
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`%t w1 = StringReplace[w, {"0" -> "110", "1" -> "010"}];
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`%t st = ToCharacterCode[w1] - 48 ; (* A286801 *)
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`%t Flatten[Position[st, 0]]; (* A286802 *)
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`%t Flatten[Position[st, 1]]; (* A286803 *)
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`%Y Cf. A171588, A286802, A286803.
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`%K nonn,easy
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`%O 1
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`%A _Clark Kimberling_, May 16 2017
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