A121604 Numbers k such that the radius of the smallest circle into which A121603(m) unit circles can be packed is 1 + csc(Pi/k).

2, 3, 4, 5, 6, 6, 7, 8, 9

Offset

0,1

Comments

From the diagrams in the link it appears likely that 10,12,12 are the next three terms.

Links

Table of n, a(n) for n=0..8.

E. Friedman, Erich's Packing Center: "Circles in Circles"

Example

See A121602 for the case a(8) = 9 pertaining to A121603(8) = 11 unit circles.

Crossrefs

Cf. A121603, A121570, A121598, A121601, A121602.

Sequence in context: A086419 A287354 A025548 * A071520 A195918 A371156

Adjacent sequences: A121601 A121602 A121603 * A121605 A121606 A121607

Keyword

nonn

Author

Rick L. Shepherd, Aug 09 2006

Status

approved