A279210 - OEIS

A279210

Length of second run of 1's in binary expansion of n.

0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 2, 0, 1, 0, 0, 0, 1, 1, 2, 1, 1, 2, 3, 0, 1, 1, 2, 0, 1, 0, 0, 0, 1, 1, 2, 1, 1, 2, 3, 1, 1, 1, 1, 2, 2, 3, 4, 0, 1, 1, 2, 1, 1, 2, 3, 0, 1, 1, 2, 0, 1, 0, 0, 0, 1, 1, 2, 1, 1, 2, 3, 1, 1, 1, 1, 2, 2, 3, 4, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 4, 5, 0, 1, 1, 2, 1

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OFFSET

0,12

LINKS

Michael De Vlieger, Table of n, a(n) for n = 0..10000

FORMULA

a(2*n) = a(n). - David A. Corneth, Oct 12 2018

EXAMPLE

46 = 101110_2 so a(46) = 3.

MATHEMATICA

Table[First[Map[Length, Rest@ DeleteCases[#, w_ /; First@ w == 0] &@ Split@ IntegerDigits[n, 2]] /. {} -> {0}], {n, 100}] (* Michael De Vlieger, Dec 23 2016 *)

CROSSREFS

Cf. A090996, A279209.

Sequence in context: A231189 A363857 A219558 * A232243 A034876 A091393

Adjacent sequences: A279207 A279208 A279209 * A279211 A279212 A279213

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane, Dec 22 2016

EXTENSIONS

More terms from Michael De Vlieger, Dec 23 2016

STATUS

approved