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

1,2

Links

Table of n, a(n) for n=1..49.

Example

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

Prog

(FORTRAN) See A071339.

Crossrefs

Cf. A071339-A071347.

Sequence in context: A304807 A045920 A242466 * A224855 A366938 A254608

Adjacent sequences: A071341 A071342 A071343 * A071345 A071346 A071347

Keyword

easy,nonn

Author

Hugo Pfoertner, May 22 2002

Extensions

Edited by Don Reble, Nov 06 2005

Status

approved