A194666 Number of k in [1,n] for which <r^n>+<r^k> > 1, where < > = fractional part and r = sqrt(3).

1, 0, 0, 0, 2, 0, 3, 0, 2, 0, 6, 0, 5, 0, 8, 0, 9, 0, 10, 0, 11, 0, 10, 0, 13, 0, 11, 0, 8, 0, 16, 0, 17, 0, 15, 0, 19, 0, 16, 0, 18, 0, 21, 0, 7, 0, 15, 0, 9, 0, 21, 0, 27, 0, 28, 0, 27, 0, 19, 0, 11, 0, 24, 0, 29, 0, 9, 0, 23, 0, 18, 0, 6, 0, 16, 0, 39, 0, 39, 0, 32, 0, 2, 0, 6, 0

Offset

1,5

Links

Table of n, a(n) for n=1..86.

Mathematica

r = Sqrt[3]; z = 13;
p[x_] := FractionalPart[x]; f[x_] := Floor[x];
w[n_, k_] := p[r^n] + p[r^k] - p[r^n + r^k]
Flatten[Table[w[n, k], {n, 1, z}, {k, 1, n}]]
TableForm[Table[w[n, k], {n, 1, z}, {k, 1, n}]]
s[n_] := Sum[w[n, k], {k, 1, n}]  (* A194666 *)
Table[s[n], {n, 1, 100}]
h[n_, k_] := f[p[n*r] + p[k*r]]
Flatten[Table[h[n, k], {n, 1, z}, {k, 1, n}]]
  (* A194667 *)
TableForm[Table[h[n, k], {n, 1, z}, {k, 1, n}]]
t[n_] := Sum[h[n, k], {k, 1, n}]
Table[t[n], {n, 1, 100}]   (* A194668 *)

Crossrefs

Sequence in context: A292561 A027640 A349448 * A325799 A355930 A229946

Adjacent sequences: A194663 A194664 A194665 * A194667 A194668 A194669

Keyword

nonn

Author

Clark Kimberling, Sep 01 2011

Status

approved