OFFSET
0,2
LINKS
Hugo Pfoertner, FORTRAN program for A071339-A071347
FORMULA
a(n) = max(i=0 to n^2) A004018(i)
EXAMPLE
a(5 to 8)=12 because the circle with radius 5 touches 12 lattice points: (+-1,+-2), (+-2,+-1), (+-5,0), (0,+-5); but no circle touches more, until the radius is sqrt(65).
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Hugo Pfoertner, May 22 2002
EXTENSIONS
Edited by Don Reble, Nov 06 2005
STATUS
approved