OFFSET
0,7
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..1000
FORMULA
Area of a circle of radius r is A = Pi*r^2. Circumference of a circle of radius r is n = 2*Pi*r. Then area in terms of the circumference n is A = n^2/(4*Pi).
EXAMPLE
For a circle of circumference 10, the floor of the area A = floor(100/4/Pi) = 7.
MATHEMATICA
Table[Floor[n^2/(4*Pi)], {n, 0, 25}] (* G. C. Greubel, Oct 21 2016 *)
PROG
(PARI) g(n) = for(c=0, n, a=c^2/4/Pi; print1(floor(a)", "))
(PARI) a(n) = n^2\(4*Pi); \\ Michel Marcus, Oct 22 2016
CROSSREFS
KEYWORD
nonn
AUTHOR
Cino Hilliard, Feb 27 2008
STATUS
approved