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A084828
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Maximum number of spheres of radius one that can be packed in a sphere of radius n.
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5
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OFFSET
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1,2
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COMMENTS
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a(4) and a(5) are experimental values. Although A121346(5) claims a lower bound of a(5)=68, it is conjectured from extensive numerical search that this value is unachievable and therefore a(5)=67.
The conjecture a(5)=67 was proved wrong by Yu Liang, who found an arrangement of 68 spheres of radius 1 fitting into a sphere of radius 5.
Lower bounds for the next terms are a(6)>=122 and a(7)>=198. See E. Specht's webpage for latest data. - Hugo Pfoertner, Jan 22 2024
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LINKS
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CROSSREFS
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KEYWORD
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hard,more,nonn
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AUTHOR
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EXTENSIONS
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a(5) corrected, based on private communication from Yu Liang, by Hugo Pfoertner, Aug 24 2011
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STATUS
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approved
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