A334046 - cp's OEIS frontend

A334046 a(n) is the number of points of the set { (k, prime(k)), k = 1..n-1 } that are not visible from the point (n, prime(n)) (where prime(n) denotes the n-th prime number).

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	0
7	1
8	2
9	2
10	1
11	1
12	2
13	3
14	2
15	4
16	4
17	3
18	5
19	2
20	3
21	6
22	5
23	6
24	4
25	2
26	3
27	5
28	4
29	4
30	6
31	2
32	2
33	5
34	4
35	4
36	6
37	7
38	5
39	7
40	7
41	6
42	6
43	7
44	6
45	8
46	8
47	7
48	5
49	4
50	4
51	5
52	8
53	8
54	6
55	7
56	7
57	8
58	8
59	12
60	10
61	11
62	12
63	6
64	7
65	11
66	10
67	5
68	5
69	7
70	6
71	10
72	10
73	10
74	11
75	11
76	12
77	15
78	12
79	13
80	13
81	11

[0, 0, 0, 1, 0, 0, 1, 2, 2, 1, 1, 2, 3, 2, 4, 4, 3, 5, 2, 3, 6, 5, 6, 4, 2, 3, 5, 4, 4, 6, 2, 2, 5, 4, 4, 6, 7, 5, 7, 7, 6, 6, 7, 6, 8, 8, 7, 5, 4, 4, 5, 8, 8, 6, 7, 7, 8, 8, 12, 10, 11, 12, 6, 7, 11, 10, 5, 5, 7, 6, 10, 10, 10, 11, 11, 12, 15, 12, 13, 13, 11]

cp's OEIS Frontend

A334046 a(n) is the number of points of the set { (k, prime(k)), k = 1..n-1 } that are not visible from the point (n, prime(n)) (where prime(n) denotes the n-th prime number).

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	0
7	1
8	2
9	2
10	1
11	1
12	2
13	3
14	2
15	4
16	4
17	3
18	5
19	2
20	3
21	6
22	5
23	6
24	4
25	2
26	3
27	5
28	4
29	4
30	6
31	2
32	2
33	5
34	4
35	4
36	6
37	7
38	5
39	7
40	7
41	6
42	6
43	7
44	6
45	8
46	8
47	7
48	5
49	4
50	4
51	5
52	8
53	8
54	6
55	7
56	7
57	8
58	8
59	12
60	10
61	11
62	12
63	6
64	7
65	11
66	10
67	5
68	5
69	7
70	6
71	10
72	10
73	10
74	11
75	11
76	12
77	15
78	12
79	13
80	13
81	11

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	0
7	1
8	2
9	2
10	1
11	1
12	2
13	3
14	2
15	4
16	4
17	3
18	5
19	2
20	3
21	6
22	5
23	6
24	4
25	2
26	3
27	5
28	4
29	4
30	6
31	2
32	2
33	5
34	4
35	4
36	6
37	7
38	5
39	7
40	7
41	6
42	6
43	7
44	6
45	8
46	8
47	7
48	5
49	4
50	4
51	5
52	8
53	8
54	6
55	7
56	7
57	8
58	8
59	12
60	10
61	11
62	12
63	6
64	7
65	11
66	10
67	5
68	5
69	7
70	6
71	10
72	10
73	10
74	11
75	11
76	12
77	15
78	12
79	13
80	13
81	11

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	0
7	1
8	2
9	2
10	1
11	1
12	2
13	3
14	2
15	4
16	4
17	3
18	5
19	2
20	3
21	6
22	5
23	6
24	4
25	2
26	3
27	5
28	4
29	4
30	6
31	2
32	2
33	5
34	4
35	4
36	6
37	7
38	5
39	7
40	7
41	6
42	6
43	7
44	6
45	8
46	8
47	7
48	5
49	4
50	4
51	5
52	8
53	8
54	6
55	7
56	7
57	8
58	8
59	12
60	10
61	11
62	12
63	6
64	7
65	11
66	10
67	5
68	5
69	7
70	6
71	10
72	10
73	10
74	11
75	11
76	12
77	15
78	12
79	13
80	13
81	11