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A121603
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Numbers n such that the radius of the smallest circle into which n unit circles can be packed is 1 + csc(Pi/k), where k >= 2 is an integer.
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1
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OFFSET
| 1,1
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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.
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LINKS
| E. Friedman, Erich's Packing Center: "Circles in Circles"
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EXAMPLE
| See A121602 for the case n=11 involving a 9-gon.
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CROSSREFS
| Cf. A121604, A121570, A121598, A121601, A121602.
Sequence in context: A004916 A120126 A062399 * A031086 A127288 A127287
Adjacent sequences: A121600 A121601 A121602 * A121604 A121605 A121606
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KEYWORD
| nonn
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AUTHOR
| Rick L. Shepherd (rshepherd2(AT)hotmail.com), Aug 09 2006
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