OFFSET
1,2
LINKS
Clark Kimberling, Table of n, a(n) for n = 1..400
EXAMPLE
MATHEMATICA
z = 300; p[k_] := p[k] = Sum[1/((h^2)*Binomial[2 h, h]), {h, 1, k}]
d = N[Table[Pi^2/18 - p[k], {k, 1, z/5}], 12]
f[n_] := f[n] = Select[Range[z], Pi^2/18 - p[#] < 1/3^n &, 1]
u = Flatten[Table[f[n], {n, 1, z}]] (* A248610 *)
d = Differences[u]
v = Flatten[Position[d, 0]] (* A248611 *)
w = Flatten[Position[d, 1]] (* A248612 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Oct 10 2014
STATUS
approved