A325607 - OEIS

%I #9 Jun 17 2019 02:26:37

%S 10199370,13125369,13458288,21374352,22339875,29634813,39738060,

%T 32719728,42182412,47211294,51258282,53418859,43209969,55756413,

%U 48330114,49362234,62965329,52850433,72584082,73167345,73891893,71088744,61716444,66526029,69342999,80514873,71127132

%N Lower left-hand y-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, A325606.

%K nonn

%O 1,1

%A _Benjamin Hutz_, May 31 2019

%E a(6)-a(27) from _Giovanni Resta_, Jun 05 2019