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A179857 Smallest number greater than n having in binary representation exactly twice the number of ones as n has in binary representation. 4
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(n) = Min{m: m > n and A000120(m) = 2*A000120(n)};

a(n) is odd;

n < a(n) < A000290(A062383(n));

a(A000079(n)) = A000051(n);

A024036 and A000225 give record values and where they occur.

LINKS

R. Zumkeller, Table of n, a(n) for n = 0..1000

Index entries for sequences related to binary expansion of n

MATHEMATICA

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 *)

CROSSREFS

Cf. A086799.

Sequence in context: A287188 A100347 A165405 * A260078 A163590 A114320

Adjacent sequences:  A179854 A179855 A179856 * A179858 A179859 A179860

KEYWORD

base,nonn

AUTHOR

Reinhard Zumkeller, Jul 31 2010

EXTENSIONS

Definition clarified by Harvey P. Dale, Sep 20 2016

STATUS

approved

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Last modified July 27 04:25 EDT 2017. Contains 289841 sequences.