Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A121539
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A121539 Numbers n such that the binary expansion of n ends in an even number of 1's. +0
6
0, 2, 3, 4, 6, 8, 10, 11, 12, 14, 15, 16, 18, 19, 20, 22, 24, 26, 27, 28, 30, 32, 34, 35, 36, 38, 40, 42, 43, 44, 46, 47, 48, 50, 51, 52, 54, 56, 58, 59, 60, 62, 63, 64, 66, 67, 68, 70, 72, 74, 75, 76, 78, 79, 80, 82, 83, 84, 86, 88, 90, 91, 92, 94, 96, 98, 99, 100 (list; graph; listen)
OFFSET

1,2

COMMENT

Equivalently, increasing sequence defined by: "if n appears a*n+b does not", case a(1)=0, a=2, b=1.

Every even number ends with zero 1's, and zero is even, so every even number is a member.

Consists of all even numbers together with A131323.

EXAMPLE

11 in binary is 1011, which ends with two 1's.

MATHEMATICA

s={2}; With[{a=2, b=1}, Do[If[FreeQ[s, (n-b)/a], AppendTo[s, n]], {n, 3, 100}]]; s

CROSSREFS

Cf. A121538, A121540, A121541, A121542.

Sequence in context: A018271 A073667 A097274 this_sequence A122138 A047418 A026508

Adjacent sequences: A121536 A121537 A121538 this_sequence A121540 A121541 A121542

KEYWORD

nonn

AUTHOR

Zak Seidov (zakseidov(AT)yahoo.com), Aug 08 2006

EXTENSIONS

Edited by njas at the suggestion of Stefan Steinerberger, Dec 17 2007

page 1

Search completed in 0.002 seconds

Lookup | Welcome | Find friends | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
More pages | Superseeker | Maintained by N. J. A. Sloane (njas@research.att.com)

Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.


AT&T Labs Research