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Search: id:A141228
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| A141228 |
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Number of points having maximal visibility in a cubic n x n x n lattice. |
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+0
4
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| 1, 8, 1, 8, 20, 64, 20, 32, 64, 216, 13, 432, 64, 64, 20, 32, 8, 32, 32, 216, 64, 64, 27, 8, 64, 216, 7, 32, 64, 352, 32, 216, 8, 8, 125, 64, 8, 24, 1, 8, 64, 8, 32, 24, 8, 8, 27, 8, 8, 8
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OFFSET
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1,2
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COMMENT
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Sequence A141227 gives the maximum number of points visible from some point. By symmetry, when a(n) is odd, the central point in the lattice can see the maximal number of points. When a(n)=1, the central point is the only such point. Apparently the numbers n in A141226 produce both the n x n and n x n x n lattices having central points with maximum visibility.
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MATHEMATICA
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Table[mx=0; pts=0; Do[cnt=0; Do[If[GCD[d-a, e-b, f-c]<2, cnt++ ], {a, n}, {b, n}, {c, n}]; If[cnt>mx, mx=cnt; pts=1, If[cnt==mx, pts++ ]], {d, n}, {e, n}, {f, n}]; pts, {n, 10}]
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CROSSREFS
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Cf. A141225.
Sequence in context: A093565 A081777 A098367 this_sequence A133820 A019864 A021126
Adjacent sequences: A141225 A141226 A141227 this_sequence A141229 A141230 A141231
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KEYWORD
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nonn
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AUTHOR
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T. D. Noe (noe(AT)sspectra.com), Jun 15 2008
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