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A033177 Number of distinct distances between n electrons in minimal energy configuration on a sphere. 2
0, 1, 1, 1, 3, 2, 4, 4, 6, 7, 20, 3, 28, 9, 21, 12, 14, 18, 52, 26, 69, 17, 48, 16, 160, 168 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

Most of the higher terms of this sequence just refer to the best configurations known today.

How is this defined if the optimal configuration is not unique? - N. J. A. Sloane, Feb 27 2009

LINKS

Table of n, a(n) for n=1..26.

K. S. Brown, Min-Energy Configurations of Electrons On A Sphere, MathPages.

R. H. Hardin, N. J. A. Sloane & W. D. Smith, Table of best configurations presently known, Feb 1994.

Wikipedia, Thomson Problem.

EXAMPLE

See Brown's web page in LINKS.

CROSSREFS

Cf. A133491, A242617.

Sequence in context: A059851 A327637 A047993 * A175512 A240829 A284013

Adjacent sequences:  A033174 A033175 A033176 * A033178 A033179 A033180

KEYWORD

more,nonn

AUTHOR

K. S. Brown (ksbrown(AT)seanet.com)

STATUS

approved

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Last modified July 8 01:48 EDT 2020. Contains 335502 sequences. (Running on oeis4.)