A238703 - cp's OEIS frontend

A238703 a(n) = |{0 < k < n: floor(k*n/3) is prime}|.

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

[0, 0, 1, 1, 2, 1, 3, 3, 1, 3, 4, 0, 4, 2, 1, 3, 5, 0, 4, 4, 1, 4, 5, 0, 3, 4, 0, 3, 6, 0, 5, 4, 1, 6, 6, 0, 7, 4, 1, 5, 4, 0, 7, 6, 0, 8, 5, 0, 8, 7, 1, 6, 7, 0, 9, 9, 1, 9, 8, 0, 6, 7, 0, 7, 12, 0, 9, 7, 1, 11, 10, 0, 6, 8, 0, 7, 9, 0, 7, 12]

cp's OEIS Frontend

A238703 a(n) = |{0 < k < n: floor(k*n/3) is prime}|.

Table of values

List of values

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

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

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