OFFSET
1,4
COMMENTS
For most values of n these are only conjectures, supported by numerical results.
REFERENCES
For list of references given by E. Specht, see corresponding link.
LINKS
Erich Friedman, Circles in Circles
Hugo Pfoertner, Minimum area of circle needed to cover n circles of area 1
EXAMPLE
a(4)=2 because a circle of area 4 is the smallest one covering two circles of area 1.
a(9)=7 is the arrangement of 6 circles closely packed around another circle. This arrangement fits into a circle that has 3*radius of smaller circles and thus 9*their area.
CROSSREFS
KEYWORD
hard,nonn
AUTHOR
Hugo Pfoertner, Jun 01 2003.
STATUS
approved