A071340 a(n) = least positive r <= n such that the origin-centered circle of radius sqrt(r) touches A071339(n) lattice points.

0, 1, 1, 5, 5, 25, 25, 25, 25, 65, 65, 65, 65, 65, 65, 65, 65, 65, 65, 325, 325, 325, 325, 325, 325, 325, 325, 325, 325, 325, 325, 325, 325, 325, 1105, 1105, 1105, 1105, 1105, 1105, 1105, 1105, 1105, 1105, 1105, 1105, 1105, 1105, 1105, 1105, 1105, 1105, 1105

Offset

0,4

Links

Table of n, a(n) for n=0..52.

Hugo Pfoertner, Illustration

Example

a(4)=5 because the smallest circle to touch A071339(4)=8 points has radius sqrt(5).

Prog

(Fortran) ! See A071339.

Crossrefs

Cf. A071339-A071347.

Sequence in context: A256135 A227076 A223186 * A162962 A074872 A056451

Adjacent sequences: A071337 A071338 A071339 * A071341 A071342 A071343

Keyword

easy,nonn

Author

Hugo Pfoertner, May 22 2002

Extensions

Edited by Don Reble, Nov 06 2005

Status

approved