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

0,3

Links

Table of n, a(n) for n=0..48.

Example

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

Prog

(FORTRAN) See A071339.

Crossrefs

Cf. A071339-A071347.

Sequence in context: A247325 A140683 A304599 * A272898 A102981 A257487

Adjacent sequences: A071338 A071339 A071340 * A071342 A071343 A071344

Keyword

easy,nonn

Author

Hugo Pfoertner, May 22 2002

Extensions

Edited by Don Reble, Nov 06 2005

Status

approved