

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
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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.


LINKS

Table of n, a(n) for n=1..22.


FORMULA

a(k)= A121500(A121501(k)),k>=1.


EXAMPLE

(n(k),m(k)) pairs (A121501(k),a(k)), 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
Adjacent sequences: A121499 A121500 A121501 * A121503 A121504 A121505


KEYWORD

nonn,more


AUTHOR

Wolfdieter Lang, Aug 16 2006


STATUS

approved



