login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A089648 Numbers whose numbers of zeros and ones in binary representation differ at most by 1. 4
0, 1, 2, 4, 5, 6, 9, 10, 12, 17, 18, 19, 20, 21, 22, 24, 25, 26, 28, 35, 37, 38, 41, 42, 44, 49, 50, 52, 56, 67, 69, 70, 71, 73, 74, 75, 76, 77, 78, 81, 82, 83, 84, 85, 86, 88, 89, 90, 92, 97, 98, 99, 100, 101, 102, 104, 105, 106, 108, 112, 113, 114, 116, 120, 135, 139 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

A031443 is a subsequence; abs(A037861(a(n))) <= 1.

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Eric Weisstein's World of Mathematics, Digit Count

Index entries for sequences related to binary expansion of n

MATHEMATICA

Select[Range[0, 7! ], Abs[DigitCount[ #, 2, 0]-DigitCount[ #, 2, 1]]<2 &] (* Vladimir Joseph Stephan Orlovsky, Feb 16 2010 *)

PROG

(Haskell)

a089648 n = a089648_list !! (n-1)

a089648_list = filter ((<= 1) . abs . a037861) [0..]

-- Reinhard Zumkeller, Mar 31 2015

CROSSREFS

Cf. A023416, A000120.

Cf. A037861, union of A031443, A031444 and A031448.

Sequence in context: A125297 A194469 A143072 * A062861 A120629 A169694

Adjacent sequences:  A089645 A089646 A089647 * A089649 A089650 A089651

KEYWORD

nonn,base

AUTHOR

Reinhard Zumkeller, Jan 02 2004

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 2 14:41 EDT 2020. Contains 335401 sequences. (Running on oeis4.)