OFFSET
1,1
COMMENTS
The pairs (n(k),m(k)):=(A121501(k),a(k)), k>=1, lead to a strictly decreasing sequence of relative errors E(n(k),m(k)) in the circle area approximation problem described in A121500. For each k=1,2,... the unit circle has inscribed n(k)-gon and circumscribed m(k)-gon.
For the sequence of relative errors E(n(k),m(k)), k=1..20 see the W. Lang link in A121501.
EXAMPLE
(n(k),m(k)) pairs (A121501(k),a(k)), for k=1..7: [3, 3], [5, 4], [6, 5], [8, 6], [11, 8], [14, 10], [15, 11].
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Wolfdieter Lang, Aug 16 2006
STATUS
approved