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A325604 Lower left-hand x-coordinate for 3 X 3 invisible forest with 0 < x < y. 12
1274, 1884, 1924, 1448, 594, 2254, 2364, 2210, 1598, 1000, 2624, 740, 664, 2408, 1924, 1924, 494, 1000, 230, 2914, 650, 1000, 644, 3794, 1924, 3794, 2430, 104, 4146, 3534, 4234, 1748, 2254, 2408, 1274, 1064, 4640, 4520, 2484, 3794 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

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).

LINKS

Benjamin Hutz, Table of n, a(n) for n = 1..1000

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.

EXAMPLE

(1274,1308), (1884,2000), (1924,2330), (1448,2714), (594,3128), (2254,2540), (2364,2924), (2210,3080), (1598,3484), (1000,3794)

CROSSREFS

Cf. A157426, A157427, A157428, A157429.

Cf. A325602, A325603, A325605, A325606, A325607.

Sequence in context: A273000 A282328 A187465 * A230758 A318201 A236013

Adjacent sequences:  A325601 A325602 A325603 * A325605 A325606 A325607

KEYWORD

nonn

AUTHOR

Benjamin Hutz, May 10 2019

STATUS

approved

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Last modified September 25 00:48 EDT 2020. Contains 337333 sequences. (Running on oeis4.)