A102533 Number of distinct values of i*j + j*k + k*i with 1 <= i < j <= k <= n.

0, 1, 4, 10, 20, 35, 50, 72, 100, 129, 163, 203, 244, 290, 346, 400, 461, 526, 600, 676, 756, 836, 925, 1018, 1117, 1220, 1325, 1435, 1554, 1683, 1811, 1938, 2078, 2212, 2367, 2526, 2677, 2835, 3003, 3169, 3350, 3527, 3714, 3898, 4099, 4304, 4498, 4713

Offset

0,3

Links

Table of n, a(n) for n=0..47.

Mathematica

f[n_] := Length[ Union[ Flatten[ Table[i*j + j*k + k*i, {i, n}, {j, i + 1, n}, {k, j, n}] ]]]; Table[ f[n], {n, 48}]

Crossrefs

Cf. A100439, A100440, A102534.

Sequence in context: A301162 A353128 A362072 * A341133 A008033 A047954

Adjacent sequences: A102530 A102531 A102532 * A102534 A102535 A102536

Keyword

nonn

Author

Robert G. Wilson v, Jan 13 2005

Status

approved