A248149 Numbers k such that A248148(k+1) = A248148(k).

6, 12, 17, 22, 27, 32, 37, 42, 47, 52, 57, 62, 67, 72, 77, 82, 87, 92, 97, 102, 107, 112, 116, 121, 126, 131, 136, 141, 146, 151, 155, 160, 165, 170, 175, 180, 185, 190, 194, 199, 204, 209, 214, 219, 224, 228, 233, 238, 243, 248, 253, 258, 262, 267, 272, 277

Offset: 1

Author

Clark Kimberling, Oct 02 2014

Keywords

• nonn
• easy

Links

• Clark Kimberling, Table of n, a(n) for n = 1..400

Crossrefs

Cf. A248148, A248111.

Programs

Mathematica

z = 400; p[k_] := p[k] = Sum[1/Binomial[2 h, h], {h, 1, k}] ; r = 1/3 + 2 Pi/Sqrt[243];
N[Table[r - p[n], {n, 1, z/50}]]
f[n_] := f[n] = Select[Range[z], r - p[#] < 1/3^n &, 1]
u = Flatten[Table[f[n], {n, 1, z}]]  (* A248148 *)
v = Flatten[Position[Differences[u], 0]] (* A248149 *)