OFFSET
3,1
COMMENTS
Refer to construction rule in article "Circle-Circle Intersection" in MathWorld.
For n > 4, the intersected areas appearing at many sizes. In this case the minimum areas are considered. See illustration in links.
LINKS
Kival Ngaokrajang, Illustration of initial terms
Eric Weisstein's World of Mathematics, Circle-Circle Intersection
FORMULA
For n > 2, a(n) = floor(Pi/area), where area = 2*arccos(cd/2) - (1/2)*cd*sqrt(4-cd^2), cd = 2*sin(((ang*360/n)*Pi/180)/2), ang = floor((n-1)/2).
PROG
(PARI) {for (n=3, 100, ang=floor((n-1)/2); cd=2*sin(((ang*360/n)*Pi/180)/2); area=2*acos(cd/2)-(1/2)*cd*(4-cd^2)^(1/2); print1(floor(Pi/area), ", "))}
CROSSREFS
KEYWORD
nonn
AUTHOR
Kival Ngaokrajang, Jun 15 2014
STATUS
approved