A227405 Order of the symmetry group of the densest possible packing of N circles in a larger circle. (If there are different patterns with the same density pick the largest value of the symmetry group order.)

4, 6, 8, 10, 12, 12, 14, 16, 2, 2, 6, 2

Offset

2,1

Comments

a(14) is unknown but conjectured to be 2.

The conjectured sequence is 4, 6, 8, 10, 12, 12, 14, 16, 2, 2, 6, 2, 2, 10, 2, 2, 12, 12, 2...

Links

Table of n, a(n) for n=2..13.

Wikipedia, Circle packing in a circle

Crossrefs

Sequence in context: A139203 A179372 A240024 * A061408 A063287 A228358

Adjacent sequences: A227402 A227403 A227404 * A227406 A227407 A227408

Keyword

sign,hard,more

Author

Keenan Pepper, Sep 21 2013

Status

approved