A173897 - cp's OEIS frontend

A173897 a(n) is the number of Sophie Germain primes (A005384) between prime(n)^2 and prime(n+1)^2.

n	a(n)
1	1
2	2
3	2
4	4
5	1
6	7
7	2
8	5
9	9
10	2
11	8
12	9
13	2
14	10
15	12
16	12
17	4
18	16
19	7
20	6
21	14
22	11
23	19
24	16
25	10
26	6
27	11
28	9
29	11
30	49
31	11
32	18
33	6
34	43
35	10
36	21
37	18
38	15
39	25
40	21
41	7
42	43
43	11
44	19
45	12
46	53
47	55
48	18
49	9
50	20
51	35
52	9
53	50
54	31
55	32
56	28
57	4
58	38
59	23
60	15
61	65
62	74
63	17
64	12
65	27
66	90
67	38
68	63
69	13
70	29
71	38
72	51
73	46
74	39
75	27
76	38
77	47
78	28

[1, 2, 2, 4, 1, 7, 2, 5, 9, 2, 8, 9, 2, 10, 12, 12, 4, 16, 7, 6, 14, 11, 19, 16, 10, 6, 11, 9, 11, 49, 11, 18, 6, 43, 10, 21, 18, 15, 25, 21, 7, 43, 11, 19, 12, 53, 55, 18, 9, 20, 35, 9, 50, 31, 32, 28, 4, 38, 23, 15, 65, 74, 17, 12, 27, 90, 38, 63, 13, 29, 38, 51, 46, 39, 27, 38, 47, 28]

cp's OEIS Frontend

A173897 a(n) is the number of Sophie Germain primes (A005384) between prime(n)^2 and prime(n+1)^2.

Table of values

List of values

n	a(n)
1	1
2	2
3	2
4	4
5	1
6	7
7	2
8	5
9	9
10	2
11	8
12	9
13	2
14	10
15	12
16	12
17	4
18	16
19	7
20	6
21	14
22	11
23	19
24	16
25	10
26	6
27	11
28	9
29	11
30	49
31	11
32	18
33	6
34	43
35	10
36	21
37	18
38	15
39	25
40	21
41	7
42	43
43	11
44	19
45	12
46	53
47	55
48	18
49	9
50	20
51	35
52	9
53	50
54	31
55	32
56	28
57	4
58	38
59	23
60	15
61	65
62	74
63	17
64	12
65	27
66	90
67	38
68	63
69	13
70	29
71	38
72	51
73	46
74	39
75	27
76	38
77	47
78	28

n	a(n)
1	1
2	2
3	2
4	4
5	1
6	7
7	2
8	5
9	9
10	2
11	8
12	9
13	2
14	10
15	12
16	12
17	4
18	16
19	7
20	6
21	14
22	11
23	19
24	16
25	10
26	6
27	11
28	9
29	11
30	49
31	11
32	18
33	6
34	43
35	10
36	21
37	18
38	15
39	25
40	21
41	7
42	43
43	11
44	19
45	12
46	53
47	55
48	18
49	9
50	20
51	35
52	9
53	50
54	31
55	32
56	28
57	4
58	38
59	23
60	15
61	65
62	74
63	17
64	12
65	27
66	90
67	38
68	63
69	13
70	29
71	38
72	51
73	46
74	39
75	27
76	38
77	47
78	28

n	a(n)
1	1
2	2
3	2
4	4
5	1
6	7
7	2
8	5
9	9
10	2
11	8
12	9
13	2
14	10
15	12
16	12
17	4
18	16
19	7
20	6
21	14
22	11
23	19
24	16
25	10
26	6
27	11
28	9
29	11
30	49
31	11
32	18
33	6
34	43
35	10
36	21
37	18
38	15
39	25
40	21
41	7
42	43
43	11
44	19
45	12
46	53
47	55
48	18
49	9
50	20
51	35
52	9
53	50
54	31
55	32
56	28
57	4
58	38
59	23
60	15
61	65
62	74
63	17
64	12
65	27
66	90
67	38
68	63
69	13
70	29
71	38
72	51
73	46
74	39
75	27
76	38
77	47
78	28