A071344 a(n) = greatest positive r <= n, such that the origin-centered sphere of radius sqrt(r) touches A071342(n) lattice points.

1, 2, 9, 14, 21, 29, 41, 62, 74, 89, 101, 134, 161, 194, 209, 230, 269, 314, 341, 374, 425, 446, 521, 569, 614, 629, 689, 761, 794, 866, 941, 941, 941, 1154, 1154, 1286, 1361, 1361, 1454, 1454, 1634, 1634, 1781, 1889, 1889, 2054, 2141, 2246, 2246

Offset: 1

Author

Hugo Pfoertner, May 22 2002

Keywords

• easy
• nonn

Examples

			a(4)=21 because the largest sphere with radius <= 4 to touch A071342(4)=48 points has radius sqrt(21).
		

Crossrefs

Cf. A071339-A071347.

Programs

FORTRAN

See A071339.

Extensions

Edited by Don Reble, Nov 06 2005