A071341 a(n) = greatest positive r <= n, such that the origin-centered circle of radius sqrt(r) touches A071339(n) lattice points.

0, 1, 4, 5, 13, 25, 25, 25, 50, 65, 85, 85, 130, 145, 185, 221, 250, 265, 305, 325, 325, 425, 425, 425, 425, 425, 650, 725, 725, 725, 850, 925, 925, 1025, 1105, 1105, 1105, 1105, 1105, 1105, 1105, 1625, 1625, 1625, 1885, 1885, 1885, 2125, 2210

Offset: 0

Author

Hugo Pfoertner, May 22 2002

Keywords

• easy
• nonn

Examples

			a(4)=13 because the largest circle with radius <= 4 to touch A071339(4)=8 points has radius sqrt(13).
		

Crossrefs

Cf. A071339-A071347.

Programs

FORTRAN

See A071339.

Extensions

Edited by Don Reble, Nov 06 2005