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A043722
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Numbers whose number of runs in the base-2 representation is congruent to 1 mod 3.
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1
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1, 3, 7, 10, 15, 18, 20, 22, 26, 31, 34, 36, 38, 40, 44, 46, 50, 52, 54, 58, 63, 66, 68, 70, 72, 76, 78, 80, 85, 88, 92, 94, 98, 100, 102, 104, 108, 110, 114, 116, 118, 122, 127, 130, 132, 134, 136, 140, 142, 144, 149, 152, 156, 158
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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Select[Range[200], Mod[Length[Split[IntegerDigits[#, 2]]], 3]==1&] (* Harvey P. Dale, Mar 24 2022 *)
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PROG
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(PARI) isok(k) = (hammingweight(bitxor(k, k>>1)) % 3) == 1; \\ Michel Marcus, Oct 04 2023
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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