A157790 - cp's OEIS frontend

A157790 Least number of lattice points on two opposite sides from which every point of a square n X n lattice is visible.

n	a(n)
1	1
2	1
3	2
4	2
5	3
6	3
7	4
8	3
9	4
10	4
11	4
12	3
13	4
14	3
15	4
16	4
17	4
18	4
19	6
20	4
21	5
22	5
23	4
24	4
25	7
26	4
27	5
28	5
29	6
30	4
31	8
32	4
33	6
34	5
35	6
36	4
37	8
38	4
39	6
40	5
41	7
42	4
43	8
44	4
45	6
46	6
47	6
48	4
49	8
50	4
51	8
52	5
53	6
54	4
55	8
56	5
57	7
58	5
59	6
60	4
61	8
62	5
63	6
64	6
65	6
66	5
67	8
68	4
69	6
70	5

[1, 1, 2, 2, 3, 3, 4, 3, 4, 4, 4, 3, 4, 3, 4, 4, 4, 4, 6, 4, 5, 5, 4, 4, 7, 4, 5, 5, 6, 4, 8, 4, 6, 5, 6, 4, 8, 4, 6, 5, 7, 4, 8, 4, 6, 6, 6, 4, 8, 4, 8, 5, 6, 4, 8, 5, 7, 5, 6, 4, 8, 5, 6, 6, 6, 5, 8, 4, 6, 5]

cp's OEIS Frontend

A157790 Least number of lattice points on two opposite sides from which every point of a square n X n lattice is visible.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	2
5	3
6	3
7	4
8	3
9	4
10	4
11	4
12	3
13	4
14	3
15	4
16	4
17	4
18	4
19	6
20	4
21	5
22	5
23	4
24	4
25	7
26	4
27	5
28	5
29	6
30	4
31	8
32	4
33	6
34	5
35	6
36	4
37	8
38	4
39	6
40	5
41	7
42	4
43	8
44	4
45	6
46	6
47	6
48	4
49	8
50	4
51	8
52	5
53	6
54	4
55	8
56	5
57	7
58	5
59	6
60	4
61	8
62	5
63	6
64	6
65	6
66	5
67	8
68	4
69	6
70	5

n	a(n)
1	1
2	1
3	2
4	2
5	3
6	3
7	4
8	3
9	4
10	4
11	4
12	3
13	4
14	3
15	4
16	4
17	4
18	4
19	6
20	4
21	5
22	5
23	4
24	4
25	7
26	4
27	5
28	5
29	6
30	4
31	8
32	4
33	6
34	5
35	6
36	4
37	8
38	4
39	6
40	5
41	7
42	4
43	8
44	4
45	6
46	6
47	6
48	4
49	8
50	4
51	8
52	5
53	6
54	4
55	8
56	5
57	7
58	5
59	6
60	4
61	8
62	5
63	6
64	6
65	6
66	5
67	8
68	4
69	6
70	5

n	a(n)
1	1
2	1
3	2
4	2
5	3
6	3
7	4
8	3
9	4
10	4
11	4
12	3
13	4
14	3
15	4
16	4
17	4
18	4
19	6
20	4
21	5
22	5
23	4
24	4
25	7
26	4
27	5
28	5
29	6
30	4
31	8
32	4
33	6
34	5
35	6
36	4
37	8
38	4
39	6
40	5
41	7
42	4
43	8
44	4
45	6
46	6
47	6
48	4
49	8
50	4
51	8
52	5
53	6
54	4
55	8
56	5
57	7
58	5
59	6
60	4
61	8
62	5
63	6
64	6
65	6
66	5
67	8
68	4
69	6
70	5