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A071344
a(n) = greatest positive r <= n, such that the origin-centered sphere of radius sqrt(r) touches A071342(n) lattice points.
4
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
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
KEYWORD
easy,nonn
AUTHOR
Hugo Pfoertner, May 22 2002
EXTENSIONS
Edited by Don Reble, Nov 06 2005
STATUS
approved