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%I #8 Jun 17 2019 02:27:08
%S 7247643,6349914,13449225,3268473,16799913,12209988,7676094,25869732,
%T 27330093,19113828,3689958,8579373,35193585,10557390,31662993,
%U 40976505,20262723,47516988,12932424,10792494,13027728,24801060,44040840,37959282,42196362,16439577,43732038
%N Lower left-hand x-coordinate for 4 X 4 invisible forest with 0 < x < y.
%C 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).
%H E. Goins, P. Harris, B. Kubik, A. Mbirika, <a href="https://arxiv.org/abs/1710.04554">Lattice Point Visibility on Generalized Lines of Sight</a>, arXiv:1710.04554 [math.NT], 2017; Amer. Math. Monthly 125 (2018) 593-601.
%H F. Herzog, B. M. Stewart, <a href="https://www.jstor.org/stable/2317753">Patterns of Visible and Nonvisible Lattice Points</a>, Amer. Math. Monthly 78 (1971) 487-496
%H S. Laishram, F. Luca, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL18/Laishram/lai2.html">Rectangles Of Nonvisible Lattice Points</a>, J. Int. Seq. 18 (2015) 15.10.8.
%e (7247643, 10199370), (6349914, 13125369), (13449225, 13458288), (3268473, 21374352), (16799913, 22339875)
%Y Cf. A157426, A157427, A157428, A157429.
%Y Cf. A325602, A325603, A325604, A325605, A325607.
%K nonn
%O 1,1
%A _Benjamin Hutz_, May 31 2019
%E a(6)-a(27) from _Giovanni Resta_, Jun 05 2019
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