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%I #16 May 31 2019 13:06:31
%S 1274,1884,1924,1448,594,2254,2364,2210,1598,1000,2624,740,664,2408,
%T 1924,1924,494,1000,230,2914,650,1000,644,3794,1924,3794,2430,104,
%U 4146,3534,4234,1748,2254,2408,1274,1064,4640,4520,2484,3794
%N Lower left-hand x-coordinate for 3 X 3 invisible forest with 0 < x < y.
%C These are 3 X 3 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 Benjamin Hutz, <a href="/A325604/b325604.txt">Table of n, a(n) for n = 1..1000</a>
%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 (1274,1308), (1884,2000), (1924,2330), (1448,2714), (594,3128), (2254,2540), (2364,2924), (2210,3080), (1598,3484), (1000,3794)
%Y Cf. A157426, A157427, A157428, A157429.
%Y Cf. A325602, A325603, A325605, A325606, A325607.
%K nonn
%O 1,1
%A _Benjamin Hutz_, May 10 2019
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