A224963 - cp's OEIS frontend

A224963 Let p = prime(n). a(n) = number of primes q less than p, such that both p+q+1 and p+q-1 are primes.

n	a(n)
1	0
2	0
3	0
4	1
5	1
6	1
7	1
8	1
9	2
10	1
11	2
12	2
13	2
14	2
15	1
16	2
17	2
18	3
19	2
20	3
21	1
22	4
23	2
24	3
25	5
26	4
27	3
28	3
29	5
30	3
31	6
32	6
33	4
34	7
35	3
36	5
37	5
38	4
39	5
40	6
41	4
42	8
43	4
44	3
45	4
46	6
47	6
48	6
49	3
50	5
51	5
52	7
53	6
54	6
55	2
56	4
57	6
58	5
59	2
60	6
61	5
62	5
63	5
64	5
65	3
66	3
67	8
68	5
69	4
70	8
71	4
72	7
73	4
74	7
75	7
76	4
77	7
78	3
79	5
80	8
81	9
82	9
83	6
84	6
85	7

[0, 0, 0, 1, 1, 1, 1, 1, 2, 1, 2, 2, 2, 2, 1, 2, 2, 3, 2, 3, 1, 4, 2, 3, 5, 4, 3, 3, 5, 3, 6, 6, 4, 7, 3, 5, 5, 4, 5, 6, 4, 8, 4, 3, 4, 6, 6, 6, 3, 5, 5, 7, 6, 6, 2, 4, 6, 5, 2, 6, 5, 5, 5, 5, 3, 3, 8, 5, 4, 8, 4, 7, 4, 7, 7, 4, 7, 3, 5, 8, 9, 9, 6, 6, 7]

cp's OEIS Frontend

A224963 Let p = prime(n). a(n) = number of primes q less than p, such that both p+q+1 and p+q-1 are primes.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	1
5	1
6	1
7	1
8	1
9	2
10	1
11	2
12	2
13	2
14	2
15	1
16	2
17	2
18	3
19	2
20	3
21	1
22	4
23	2
24	3
25	5
26	4
27	3
28	3
29	5
30	3
31	6
32	6
33	4
34	7
35	3
36	5
37	5
38	4
39	5
40	6
41	4
42	8
43	4
44	3
45	4
46	6
47	6
48	6
49	3
50	5
51	5
52	7
53	6
54	6
55	2
56	4
57	6
58	5
59	2
60	6
61	5
62	5
63	5
64	5
65	3
66	3
67	8
68	5
69	4
70	8
71	4
72	7
73	4
74	7
75	7
76	4
77	7
78	3
79	5
80	8
81	9
82	9
83	6
84	6
85	7

n	a(n)
1	0
2	0
3	0
4	1
5	1
6	1
7	1
8	1
9	2
10	1
11	2
12	2
13	2
14	2
15	1
16	2
17	2
18	3
19	2
20	3
21	1
22	4
23	2
24	3
25	5
26	4
27	3
28	3
29	5
30	3
31	6
32	6
33	4
34	7
35	3
36	5
37	5
38	4
39	5
40	6
41	4
42	8
43	4
44	3
45	4
46	6
47	6
48	6
49	3
50	5
51	5
52	7
53	6
54	6
55	2
56	4
57	6
58	5
59	2
60	6
61	5
62	5
63	5
64	5
65	3
66	3
67	8
68	5
69	4
70	8
71	4
72	7
73	4
74	7
75	7
76	4
77	7
78	3
79	5
80	8
81	9
82	9
83	6
84	6
85	7

n	a(n)
1	0
2	0
3	0
4	1
5	1
6	1
7	1
8	1
9	2
10	1
11	2
12	2
13	2
14	2
15	1
16	2
17	2
18	3
19	2
20	3
21	1
22	4
23	2
24	3
25	5
26	4
27	3
28	3
29	5
30	3
31	6
32	6
33	4
34	7
35	3
36	5
37	5
38	4
39	5
40	6
41	4
42	8
43	4
44	3
45	4
46	6
47	6
48	6
49	3
50	5
51	5
52	7
53	6
54	6
55	2
56	4
57	6
58	5
59	2
60	6
61	5
62	5
63	5
64	5
65	3
66	3
67	8
68	5
69	4
70	8
71	4
72	7
73	4
74	7
75	7
76	4
77	7
78	3
79	5
80	8
81	9
82	9
83	6
84	6
85	7