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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A178528 Tree generated by the Beatty sequence of sqrt(3). 5
1, 2, 3, 4, 5, 7, 6, 9, 8, 11, 12, 16, 10, 14, 15, 21, 13, 18, 19, 26, 20, 28, 27, 37, 17, 23, 24, 33, 25, 35, 36, 49, 22, 30, 31, 42, 32, 44, 45, 61, 34, 47, 48, 66, 46, 63, 64, 87, 29, 40, 39, 54, 41, 56, 57, 78, 43, 59, 60, 82, 62, 85, 84, 115 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A permutation of the positive integers.

LINKS

Ivan Neretin, Table of n, a(n) for n = 1..8192

Index entries for sequences that are permutations of the natural numbers

FORMULA

Let r=sqrt(3) and s=r/(r-1). The tree-array T(n,k) is then

given by rows: T(0,0)=1; T(1,0)=2;

T(n,2j)=Floor(r*T(n-1),j));

T(n,2j+1)=Floor((s*T(n-1,j));

for j=0,1,...,2^(n-1)-1, n>=2.

EXAMPLE

First levels of the tree:

.....................1

.....................2

..............3..............4

..........5.......7......6.......9

........8..11..12..16..10..14..15..21

MATHEMATICA

a = {1, 2}; row = {a[[-1]]}; r = Sqrt[3]; s = r/(r - 1); Do[a = Join[a, row = Flatten[{Floor[#*{r, s}]} & /@ row]], {n, 5}]; a (* Ivan Neretin, Nov 09 2015 *)

CROSSREFS

Cf. A022838 (Beatty sequence of sqrt(3)), A054406, A074049.

Sequence in context: A209637 A120750 A265672 * A183084 A185975 A232639

Adjacent sequences:  A178525 A178526 A178527 * A178529 A178530 A178531

KEYWORD

nonn,tabf

AUTHOR

Clark Kimberling, Dec 23 2010

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 October 20 22:05 EDT 2019. Contains 328291 sequences. (Running on oeis4.)