OFFSET

1,1

COMMENTS

Corresponding k values are in A121604. For these n, the centers of k unit circles can form a regular k-gon with sides of length 2 centered at the center of the larger circle. From the diagrams in the link it appears likely that 13,18,19 are the next three terms.

LINKS

EXAMPLE

See A121602 for the case n=11 involving a 9-gon.

CROSSREFS

KEYWORD

nonn

AUTHOR

Rick L. Shepherd, Aug 09 2006

STATUS

approved