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A107907
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Numbers having consecutive zeros or consecutive ones in binary representation.
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17
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3, 4, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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0,1
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COMMENTS
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Also positive integers whose binary expansion has cuts-resistance > 1. For the operation of shortening all runs by 1, cuts-resistance is the number of applications required to reach an empty word. - Gus Wiseman, Nov 27 2019
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LINKS
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FORMULA
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EXAMPLE
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The sequence of terms together with their binary expansions begins:
3: 11
4: 100
6: 110
7: 111
8: 1000
9: 1001
11: 1011
12: 1100
13: 1101
14: 1110
15: 1111
16: 10000
17: 10001
18: 10010
(End)
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MATHEMATICA
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Select[Range[100], MatchQ[IntegerDigits[#, 2], {___, x_, x_, ___}]&] (* Gus Wiseman, Nov 27 2019 *)
Select[Range[80], SequenceCount[IntegerDigits[#, 2], {x_, x_}]>0&] (* or *) Complement[Range[85], Table[FromDigits[PadRight[{}, n, {1, 0}], 2], {n, 7}]] (* Harvey P. Dale, Jul 31 2021 *)
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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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