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A221714 Numbers written in base 2 with digits rearranged to be in decreasing order. 4
0, 1, 10, 11, 100, 110, 110, 111, 1000, 1100, 1100, 1110, 1100, 1110, 1110, 1111, 10000, 11000, 11000, 11100, 11000, 11100, 11100, 11110, 11000, 11100, 11100, 11110, 11100, 11110, 11110, 11111, 100000, 110000, 110000, 111000, 110000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

This is the base-2 equivalent of A004186.

LINKS

Indranil Ghosh, Table of n, a(n) for n = 0..10000

MATHEMATICA

a[n_] := FromDigits[-Sort[-IntegerDigits[n, 2]]] (* Giovanni Resta, Jan 27 2013 *)

PROG

(Python)

def a(n):

     return "".join(sorted(bin(n)[2:], reverse=True)) # Indranil Ghosh, Jan 09 2017

CROSSREFS

For decimal equivalents see A073138.

Cf. A004086, A004185, A004186, A009996.

Sequence in context: A234472 A139707 A139709 * A108779 A288336 A288805

Adjacent sequences:  A221711 A221712 A221713 * A221715 A221716 A221717

KEYWORD

nonn,base,easy

AUTHOR

Bruce L. Rothschild and N. J. A. Sloane, Jan 26 2013

EXTENSIONS

a(18)-a(36) from Giovanni Resta, Jan 27 2013

STATUS

approved

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Last modified February 22 16:40 EST 2019. Contains 320399 sequences. (Running on oeis4.)