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