A093837 Denominators of N(r)/r^2, where N(r) is the number of lattice points inside a circle of radius r.

1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 16, 169, 196, 225, 256, 17, 324, 361, 400, 441, 484, 529, 576, 625, 676, 243, 784, 841, 900, 961, 1024, 1089, 1156, 1225, 432, 1369, 1444, 1521, 64, 1681, 1764, 1849, 1936, 2025, 2116, 2209, 2304, 343, 500