OFFSET
1,3
COMMENTS
This sequence provides insight into the manner of convergence of the sequence cos(Pi/n).
LINKS
Clark Kimberling, Table of n, a(n) for n = 1..1000
FORMULA
a(n) ~ 2*n^2/Pi^2. - Vaclav Kotesovec, Oct 09 2014
EXAMPLE
Approximations:
n ... 1-cos(Pi/n) ... 1/(1-cos(Pi/n))
1 ... 2 ............. 0.5
2 ... 1 ............. 1
3 ... 0.5 ........... 2
4 ... 0.292893 ...... 3.31421
5 ... 0.190983 ...... 5.23607
6 ... 0.133975 ...... 7.4741
MATHEMATICA
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Oct 07 2014
STATUS
approved