A237705 - cp's OEIS frontend

A237705 Number of primes p < n with pi(n-p) prime, where pi(.) is given by A000720.

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

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

cp's OEIS Frontend

A237705 Number of primes p < n with pi(n-p) prime, where pi(.) is given by A000720.

Table of values

List of values

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

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

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