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A121502
Companion sequence for A121501 used in a unit circle area approximation problem.
2
3, 4, 5, 6, 8, 10, 11, 12, 13, 15, 22, 27, 34, 46, 58, 63, 70, 75, 87, 128, 157, 198
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.
FORMULA
a(k) = A121500(A121501(k)), k>=1.
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
Sequence in context: A098171 A039031 A047309 * A180644 A202110 A267858
KEYWORD
nonn,more
AUTHOR
Wolfdieter Lang, Aug 16 2006
STATUS
approved