A229989 - cp's OEIS frontend

A229989 Number of primes in the interval [floor(n/2), floor(3n/2)].

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

[0, 2, 2, 3, 4, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 6, 7, 7, 7, 6, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11, 12, 12, 12, 12, 13, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14, 13, 14, 14, 14, 15, 16, 16, 16, 17, 18, 18, 18]

cp's OEIS Frontend

A229989 Number of primes in the interval [floor(n/2), floor(3n/2)].

Table of values

List of values

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

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

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