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A325606 Lower left-hand x-coordinate for 4 X 4 invisible forest with 0 < x < y. 11
7247643, 6349914, 13449225, 3268473, 16799913, 12209988, 7676094, 25869732, 27330093, 19113828, 3689958, 8579373, 35193585, 10557390, 31662993, 40976505, 20262723, 47516988, 12932424, 10792494, 13027728, 24801060, 44040840, 37959282, 42196362, 16439577, 43732038 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

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).

LINKS

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.

EXAMPLE

(7247643, 10199370), (6349914, 13125369), (13449225, 13458288), (3268473, 21374352), (16799913, 22339875)

CROSSREFS

Cf. A157426, A157427, A157428, A157429.

Cf. A325602, A325603, A325604, A325605, A325607.

Sequence in context: A184214 A181680 A253469 * A157378 A251356 A116236

Adjacent sequences:  A325603 A325604 A325605 * A325607 A325608 A325609

KEYWORD

nonn

AUTHOR

Benjamin Hutz, May 31 2019

EXTENSIONS

a(6)-a(27) from Giovanni Resta, Jun 05 2019

STATUS

approved

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Last modified September 18 23:30 EDT 2020. Contains 337175 sequences. (Running on oeis4.)