A237817 - cp's OEIS frontend

A237817 Number of primes p < n such that r = |{q <= n-p: q and q + 2 are both prime}| and r + 2 are both prime.

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

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

cp's OEIS Frontend

A237817 Number of primes p < n such that r = |{q <= n-p: q and q + 2 are both prime}| and r + 2 are both prime.

Table of values

List of values

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

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

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