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A287554
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Positions of 2 in A053839.
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5
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3, 6, 9, 16, 18, 21, 28, 31, 33, 40, 43, 46, 52, 55, 58, 61, 66, 69, 76, 79, 81, 88, 91, 94, 100, 103, 106, 109, 115, 118, 121, 128, 129, 136, 139, 142, 148, 151, 154, 157, 163, 166, 169, 176, 178, 181, 188, 191, 196, 199, 202, 205, 211, 214, 217, 224, 226
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OFFSET
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1,1
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COMMENTS
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a(n) - a(n-1) is in {1,2,3,4,5,6,7} for n >= 1; also, 4n - a(n) is in {0,1,2,3} for n >= 1. The first 20 numbers 4n - a(n) are 1, 2, 3, 0, 2, 3, 0, 1, 3, 0, 1, 2, 0, 1, 2, 3, 2, 3, 0, 1, with
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LINKS
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MATHEMATICA
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s = Nest[Flatten[# /. {0 -> {0, 1, 2, 3}, 1 -> {1, 2, 3, 0}, 2 -> {2, 3, 0, 1}, 3 -> {3, 0, 1, 2}}] &, {0}, 9]; (* A053839 *)
Flatten[Position[s, 0]]; (* A287552 *)
Flatten[Position[s, 1]]; (* A287553 *)
Flatten[Position[s, 2]]; (* A287554 *)
Flatten[Position[s, 3]]; (* A287555 *)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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