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Natural fractal sequence of A194069.
3

%I #5 Mar 30 2012 18:57:39

%S 1,2,1,2,3,4,1,2,3,4,1,2,3,4,5,6,1,2,3,4,5,6,7,8,1,2,3,4,5,6,7,8,1,2,

%T 3,4,5,6,7,8,9,10,1,2,3,4,5,6,7,8,9,10,11,12,1,2,3,4,5,6,7,8,9,10,11,

%U 12,1,2,3,4,5,6,7,8,9,10,11,12,13,14,1,2,3,4,5,6,7,8,9,10,11,12

%N Natural fractal sequence of A194069.

%C See A194029 for definitions of natural fractal sequence and natural interspersion.

%t z = 70;

%t c[k_] := 1 + Floor[(2/3) k^2];

%t c = Table[c[k], {k, 1, z}] (* A194069 *)

%t f[n_] := If[MemberQ[c, n], 1, 1 + f[n - 1]]

%t f = Table[f[n], {n, 1, 300}] (* A194070 *)

%t r[n_] := Flatten[Position[f, n]]

%t t[n_, k_] := r[n][[k]]

%t TableForm[Table[t[n, k], {n, 1, 7}, {k, 1, 7}]]

%t p = Flatten[Table[t[k, n - k + 1], {n, 1, 14}, {k, 1, n}]] (* A194071 *)

%t q[n_] := Position[p, n]; Flatten[Table[q[n], {n, 1, 90}]] (* A194072 *)

%Y Cf. A194029, A194069, A194071.

%K nonn

%O 1,2

%A _Clark Kimberling_, Aug 14 2011