A376761 - cp's OEIS frontend

A376761 Number of primes between the n-th composite number c(n) and 2*c(n).

n	a(n)
1	2
2	2
3	2
4	3
5	4
6	4
7	3
8	4
9	5
10	4
11	4
12	5
13	6
14	6
15	6
16	6
17	7
18	7
19	7
20	7
21	7
22	8
23	8
24	9
25	9
26	9
27	10
28	10
29	9
30	10
31	10
32	9
33	10
34	10
35	11
36	12
37	12
38	13
39	13
40	14
41	14
42	13
43	12
44	12
45	13
46	13
47	14
48	13
49	14
50	15
51	14
52	13
53	14
54	15
55	15
56	15
57	15
58	15
59	16
60	16
61	16
62	16
63	17
64	17
65	17
66	18
67	18
68	18
69	18
70	18
71	19
72	19
73	20
74	21
75	20
76	19
77	19
78	20
79	19
80	18
81	18
82	19
83	19
84	20
85	20
86	21
87	21
88	21
89	22
90	23
91	23
92	23
93	23
94	23
95	24
96	23
97	24
98	24
99	24
100	24
101	24
102	25

[2, 2, 2, 3, 4, 4, 3, 4, 5, 4, 4, 5, 6, 6, 6, 6, 7, 7, 7, 7, 7, 8, 8, 9, 9, 9, 10, 10, 9, 10, 10, 9, 10, 10, 11, 12, 12, 13, 13, 14, 14, 13, 12, 12, 13, 13, 14, 13, 14, 15, 14, 13, 14, 15, 15, 15, 15, 15, 16, 16, 16, 16, 17, 17, 17, 18, 18, 18, 18, 18, 19, 19, 20, 21, 20, 19, 19, 20, 19, 18, 18, 19, 19, 20, 20, 21, 21, 21, 22, 23, 23, 23, 23, 23, 24, 23, 24, 24, 24, 24, 24, 25]

cp's OEIS Frontend

A376761 Number of primes between the n-th composite number c(n) and 2*c(n).

Table of values

List of values

n	a(n)
1	2
2	2
3	2
4	3
5	4
6	4
7	3
8	4
9	5
10	4
11	4
12	5
13	6
14	6
15	6
16	6
17	7
18	7
19	7
20	7
21	7
22	8
23	8
24	9
25	9
26	9
27	10
28	10
29	9
30	10
31	10
32	9
33	10
34	10
35	11
36	12
37	12
38	13
39	13
40	14
41	14
42	13
43	12
44	12
45	13
46	13
47	14
48	13
49	14
50	15
51	14
52	13
53	14
54	15
55	15
56	15
57	15
58	15
59	16
60	16
61	16
62	16
63	17
64	17
65	17
66	18
67	18
68	18
69	18
70	18
71	19
72	19
73	20
74	21
75	20
76	19
77	19
78	20
79	19
80	18
81	18
82	19
83	19
84	20
85	20
86	21
87	21
88	21
89	22
90	23
91	23
92	23
93	23
94	23
95	24
96	23
97	24
98	24
99	24
100	24
101	24
102	25

n	a(n)
1	2
2	2
3	2
4	3
5	4
6	4
7	3
8	4
9	5
10	4
11	4
12	5
13	6
14	6
15	6
16	6
17	7
18	7
19	7
20	7
21	7
22	8
23	8
24	9
25	9
26	9
27	10
28	10
29	9
30	10
31	10
32	9
33	10
34	10
35	11
36	12
37	12
38	13
39	13
40	14
41	14
42	13
43	12
44	12
45	13
46	13
47	14
48	13
49	14
50	15
51	14
52	13
53	14
54	15
55	15
56	15
57	15
58	15
59	16
60	16
61	16
62	16
63	17
64	17
65	17
66	18
67	18
68	18
69	18
70	18
71	19
72	19
73	20
74	21
75	20
76	19
77	19
78	20
79	19
80	18
81	18
82	19
83	19
84	20
85	20
86	21
87	21
88	21
89	22
90	23
91	23
92	23
93	23
94	23
95	24
96	23
97	24
98	24
99	24
100	24
101	24
102	25

n	a(n)
1	2
2	2
3	2
4	3
5	4
6	4
7	3
8	4
9	5
10	4
11	4
12	5
13	6
14	6
15	6
16	6
17	7
18	7
19	7
20	7
21	7
22	8
23	8
24	9
25	9
26	9
27	10
28	10
29	9
30	10
31	10
32	9
33	10
34	10
35	11
36	12
37	12
38	13
39	13
40	14
41	14
42	13
43	12
44	12
45	13
46	13
47	14
48	13
49	14
50	15
51	14
52	13
53	14
54	15
55	15
56	15
57	15
58	15
59	16
60	16
61	16
62	16
63	17
64	17
65	17
66	18
67	18
68	18
69	18
70	18
71	19
72	19
73	20
74	21
75	20
76	19
77	19
78	20
79	19
80	18
81	18
82	19
83	19
84	20
85	20
86	21
87	21
88	21
89	22
90	23
91	23
92	23
93	23
94	23
95	24
96	23
97	24
98	24
99	24
100	24
101	24
102	25