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A179857
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Smallest number greater than n having in binary representation exactly twice the number of ones as n has in binary representation.
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4
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3, 3, 15, 5, 15, 15, 63, 9, 15, 15, 63, 15, 63, 63, 255, 17, 23, 23, 63, 23, 63, 63, 255, 27, 63, 63, 255, 63, 255, 255, 1023, 33, 39, 39, 63, 39, 63, 63, 255, 43, 63, 63, 255, 63, 255, 255, 1023, 51, 63, 63, 255, 63, 255, 255, 1023, 63, 255, 255, 1023, 255, 1023, 1023
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OFFSET
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1,1
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COMMENTS
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a(n) is odd;
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LINKS
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MATHEMATICA
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br2[n_]:=Module[{k=If[EvenQ[n], n+1, n+2], t=2*DigitCount[n, 2, 1]}, While[ DigitCount[ k, 2, 1]!=t, k=k+2]; k]; Array[br2, 70] (* Harvey P. Dale, Sep 20 2016 *)
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PROG
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(PARI) a(n) = my(k=n+1, h=hammingweight(n)); while (hammingweight(k) != 2*h, k++); k; \\ Michel Marcus, Nov 13 2023
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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