A295798 - cp's OEIS frontend

A295798 a(n) is the number of divisors d of prime(n)^2 - 1 such that prime(n) + d is prime.

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

[2, 3, 5, 5, 8, 6, 7, 11, 7, 13, 13, 8, 16, 11, 7, 11, 11, 8, 9, 23, 5, 13, 9, 22, 12, 14, 15, 8, 20, 12, 20, 19, 8, 20, 14, 19, 5, 12, 10, 7, 12, 33, 24, 7, 18, 28, 20, 13, 9, 15, 21, 27, 20, 29, 12, 11, 14, 30, 5, 25, 4, 10, 33, 19, 7, 3, 12, 18, 9, 26, 13, 19, 13, 12, 40, 9, 15, 12, 24, 17, 37, 17]

cp's OEIS Frontend

A295798 a(n) is the number of divisors d of prime(n)^2 - 1 such that prime(n) + d is prime.

Table of values

List of values

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

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

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