A224139 - OEIS

A224139

Double 1's in binary representations of 2*n-1, converting to decimal and dividing by maximal possible power of 3.

1, 5, 1, 7, 17, 37, 41, 85, 11, 23, 73, 149, 1, 55, 169, 341, 65, 133, 137, 277, 145, 293, 11, 199, 161, 325, 329, 661, 337, 677, 227, 455, 43, 29, 265, 533, 91, 61, 553, 1109, 289, 581, 65, 391, 593, 1189, 1193, 2389, 107, 215, 649, 1301, 73, 439, 1321, 2645

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Peter J. C. Moses, Table of n, a(n) for n = 1..10000

EXAMPLE

Let n=6, 2*n-1=11 which in binary 1011. Number with double 1's is 1101111 which in decimal 111. Thus a(6)=111/3=37.

MATHEMATICA

Map[#/3^IntegerExponent[#, 3]&[FromDigits[Flatten[IntegerDigits[2#-1, 2]/.{1->{1, 1}}], 2]]&, Range[100]] (* Peter J. C. Moses, Mar 31 2013 *)

CROSSREFS

Sequence in context: A332459 A051854 A006569 * A320905 A193860 A211849

Adjacent sequences: A224136 A224137 A224138 * A224140 A224141 A224142

KEYWORD

nonn,base

AUTHOR

Vladimir Shevelev, Mar 31 2013

STATUS

approved