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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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 18 20:23 EDT 2019. Contains 328197 sequences. (Running on oeis4.)