login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A078839 Numbers n such that the binary expansion of 3^n has the same number of 0's and 1's. 0
2, 12, 69, 73, 150, 184, 252, 328, 339, 464, 483, 541, 729, 747, 758, 763, 1014, 1047, 1090, 1094, 1158, 1264, 1359, 1601, 1679, 1693, 1698, 1780, 2368, 2641, 2815, 3292, 3393, 3606, 3682, 3857, 3909, 3919, 3963, 4087, 4111, 4289, 4314, 5017, 5398, 5466 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

Does the limit of a(n)/n^2 as n -> infinity exist?

MATHEMATICA

balanced[n_] := Module[{d=IntegerDigits[n, 2]}, Plus@@d==Length[d]/2]; Select[Range[0, 5500], balanced[3^# ]&]

CROSSREFS

Cf. A031443, A011754.

Sequence in context: A056636 A174327 A128103 * A026306 A116398 A001542

Adjacent sequences:  A078836 A078837 A078838 * A078840 A078841 A078842

KEYWORD

nonn,base

AUTHOR

Benoit Cloitre (benoit7848c(AT)orange.fr), Dec 06 2002

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 15 21:27 EST 2012. Contains 205859 sequences.