A256465 Number of points in a circle of squared radius n, points on the circle counted half.

3, 7, 9, 11, 17, 21, 21, 23, 27, 33, 37, 37, 41, 45, 45, 47, 53, 59, 61, 65, 69, 69, 69, 69, 75, 85, 89, 89, 93, 97, 97, 99, 101, 105, 109, 111, 117, 121, 121, 125, 133, 137, 137, 137, 141, 145, 145, 145, 147, 155, 161, 165, 173, 177, 177, 177, 177, 181, 185

Offset: 1

Author

R. J. Mathar, Mar 30 2015

Keywords

• nonn
• easy

Links

• S. W. P. Steen, An expression for the number of lattice-points in a circle, Q. J. Math. 1 (1930) 232-235.

Crossrefs

Cf. A057655, A004018.

Formula

a(n) = A057655(n) - A004018(n)/2.