A258244 - OEIS

%I #4 Jun 11 2015 10:36:07

%S 0,2,1,3,5,3,5,7,2,4,4,6,8,6,8,10,4,6,8,6,8,8,10,12,3,5,7,5,7,5,7,9,7,

%T 9,11,9,11,13,7,9,9,11,13,11,13,15,5,7,7,9,11,9,11,13,7,9,11,9,11,9,

%U 11,13,11,13,15,13,15,4,6,8,6,8,10,8,10,12,6,8

%N Number of steps from n to 0, where allowable steps are x -> [x/e] if x = is in A022843 (the Beatty sequence for e) and x -> [e*x] otherwise, where [ ] = floor.

%C a(n) = number of edges from 0 to n in the tree at A258243.

%H Clark Kimberling, <a href="/A258244/b258244.txt">Table of n, a(n) for n = 0..10000</a>

%e 20->54->19->6->16->5->1->2->0, so that a(20) = 8.

%t r = E; w = Table[Floor[r*n], {n, 1, 1000}];

%t f[x_] := If[MemberQ[w, x], Floor[x/r], Floor[r*x]];

%t g[x_] := Drop[FixedPointList[f, x], -1];

%t Table[-1+ Length[g[n]], {n, 0, 100}]

%Y Cf. A022843, A258243, A258212.

%K nonn,easy

%O 0,2

%A _Clark Kimberling_, Jun 08 2015