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A035516 Triangular array formed from Zeckendorf expansion of integers: repeatedly subtract the largest Fibonacci number you can until nothing remains. 14

%I

%S 0,1,2,3,3,1,5,5,1,5,2,8,8,1,8,2,8,3,8,3,1,13,13,1,13,2,13,3,13,3,1,

%T 13,5,13,5,1,13,5,2,21,21,1,21,2,21,3,21,3,1,21,5,21,5,1,21,5,2,21,8,

%U 21,8,1,21,8,2,21,8,3,21,8,3,1,34,34,1,34,2,34,3,34,3,1,34,5,34,5,1,34,5,2

%N Triangular array formed from Zeckendorf expansion of integers: repeatedly subtract the largest Fibonacci number you can until nothing remains.

%C Row n has A007895(n) terms.

%D Zeckendorf, E., Repr├ęsentation des nombres naturels par une somme des nombres de Fibonacci ou de nombres de Lucas, Bull. Soc. Roy. Sci. Li├Ęge 41, 179-182, 1972.

%H T. D. Noe, <a href="/A035516/b035516.txt">Rows n=0..1000 of triangle, flattened</a>

%H N. J. A. Sloane, <a href="/classic.html#WYTH">Classic Sequences</a>

%e 16 = 13 + 3, so row 16 is 13, 6.

%e The first few rows are:

%e 0;

%e 1;

%e 2;

%e 3;

%e 3, 1;

%e 5;

%e 5, 1;

%e 5, 2;

%e 8;

%e 8, 1;

%e 8, 2;

%e ...

%e Row 1000000 is 832040,121393,46368,144,55. Indeed, the Maple program yields in no time Z(1000000) = {55,144,46368,121393,832040}. - _Emeric Deutsch_, Oct 22 2014

%p with(combinat): Z := proc (n) local F, LF, A, m: F := proc (n) options operator, arrow: fibonacci(n) end proc: LF := proc (m) local i: for i from 0 while F(i) <= m do end do: F(i-1) end proc: A := {}: m := n: while 0 < m do A := `union`(A, {LF(m)}): m := m-LF(m) end do: A end proc: # The Maple program, with the command Z(n), yields the set of the Fibonacci numbers in the Zeckendorf representation of n (terms in {} are in reverse order). - _Emeric Deutsch_, Oct 21 2014

%t t = Fibonacci /@ Range@ 12; Table[If[MemberQ[t, n], {n}, Most@ MapAt[# + 1 &, Abs@ Differences@ FixedPointList[# - First@ Reverse@ TakeWhile[t, Function[k, # >= k]] &, n], -1]], {n, 41}] // Flatten (* faster, or *)

%t t = Fibonacci /@ Range@ 12; {{0}}~Join~Table[First@ Select[ Select[ IntegerPartitions@ n, Times @@ Boole@ Map[MemberQ[t, #] &, #] == 1 &], Times @@ Boole@ Map[# > 1 &, Abs@ Differences@ Map[Position[t, #][[1, 1]] &, #, {1}]] == 1 &], {n, 41}] // Flatten (* _Michael De Vlieger_, May 17 2016 *)

%o (Haskell)

%o a035516 n k = a035516_tabf !! n !! k

%o a035516_tabf = map a035516_row [0..]

%o a035516_row 0 = [0]

%o a035516_row n = z n $ reverse $ takeWhile (<= n) a000045_list where

%o z 0 _ = []

%o z x (f:fs'@(_:fs)) = if f <= x then f : z (x - f) fs else z x fs'

%o -- _Reinhard Zumkeller_, Mar 10 2013

%Y Cf. A035517, A035514, A035515, A000045, A106530, A273156.

%K nonn,easy,tabf

%O 0,3

%A _N. J. A. Sloane_

%E More terms from _James A. Sellers_, Dec 13 1999

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Last modified October 15 16:30 EDT 2018. Contains 316236 sequences. (Running on oeis4.)