A289493 - cp's OEIS frontend

A289493 Number of primes in the interval [2n, 3n].

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

[2, 1, 1, 1, 2, 2, 2, 3, 2, 2, 3, 2, 3, 4, 4, 4, 4, 5, 4, 5, 5, 4, 5, 5, 6, 6, 6, 7, 7, 7, 6, 6, 7, 7, 8, 8, 8, 9, 9, 8, 8, 7, 8, 9, 8, 9, 10, 10, 9, 10, 10, 9, 10, 9, 9, 10, 9, 10, 10, 11, 12, 12, 12, 12, 13, 13, 14, 14, 13, 12, 13, 13, 13, 13, 13, 13, 14, 15, 14, 15]

cp's OEIS Frontend

A289493 Number of primes in the interval [2n, 3n].

Table of values

List of values

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

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

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