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A325607
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Lower left-hand y-coordinate for 4 X 4 invisible forest with 0 < x < y.
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8
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10199370, 13125369, 13458288, 21374352, 22339875, 29634813, 39738060, 32719728, 42182412, 47211294, 51258282, 53418859, 43209969, 55756413, 48330114, 49362234, 62965329, 52850433, 72584082, 73167345, 73891893, 71088744, 61716444, 66526029, 69342999, 80514873, 71127132
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OFFSET
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1,1
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COMMENTS
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These are 4 X 4 rectangles of lattice points not visible along straight lines of sight from the origin. The sequence is ordered by Euclidean distance from (0,0).
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LINKS
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Table of n, a(n) for n=1..27.
E. Goins, P. Harris, B. Kubik, A. Mbirika, Lattice Point Visibility on Generalized Lines of Sight, arXiv:1710.04554 [math.NT], 2017; Amer. Math. Monthly 125 (2018) 593-601.
F. Herzog, B. M. Stewart, Patterns of Visible and Nonvisible Lattice Points, Amer. Math. Monthly 78 (1971) 487-496
S. Laishram, F. Luca, Rectangles Of Nonvisible Lattice Points, J. Int. Seq. 18 (2015) 15.10.8.
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EXAMPLE
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(7247643, 10199370), (6349914, 13125369), (13449225, 13458288), (3268473, 21374352), (16799913, 22339875)
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CROSSREFS
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Cf. A157426, A157427, A157428, A157429.
Cf. A325602, A325603, A325604, A325605, A325606.
Sequence in context: A234404 A034635 A329527 * A282873 A219743 A276510
Adjacent sequences: A325604 A325605 A325606 * A325608 A325609 A325610
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KEYWORD
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nonn
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AUTHOR
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Benjamin Hutz, May 31 2019
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EXTENSIONS
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a(6)-a(27) from Giovanni Resta, Jun 05 2019
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STATUS
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approved
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