login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A325606 Lower left-hand x-coordinate for 4 X 4 invisible forest with 0 < x < y. 11

%I

%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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 25 19:39 EST 2021. Contains 341618 sequences. (Running on oeis4.)