A234694 - cp's OEIS frontend

A234694 a(n) = |{0 < k < n: p = k + prime(n-k) and prime(p) - p + 1 are both prime}|.

n	a(n)
1	0
2	1
3	0
4	2
5	1
6	2
7	1
8	0
9	0
10	2
11	2
12	4
13	1
14	1
15	2
16	4
17	2
18	1
19	1
20	2
21	3
22	3
23	2
24	3
25	1
26	1
27	1
28	3
29	5
30	4
31	3
32	4
33	3
34	3
35	3
36	2
37	4
38	3
39	2
40	5
41	4
42	4
43	4
44	1
45	1
46	5
47	4
48	2
49	1
50	2
51	5
52	5
53	2
54	3
55	4
56	2
57	3
58	5
59	7
60	7
61	6
62	2
63	5
64	6
65	2
66	5
67	4
68	4
69	7
70	6
71	6
72	5
73	4
74	8
75	7
76	4
77	5
78	3
79	5
80	7
81	3
82	5
83	4
84	7
85	6
86	7
87	2

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

cp's OEIS Frontend

A234694 a(n) = |{0 < k < n: p = k + prime(n-k) and prime(p) - p + 1 are both prime}|.

Table of values

List of values

n	a(n)
1	0
2	1
3	0
4	2
5	1
6	2
7	1
8	0
9	0
10	2
11	2
12	4
13	1
14	1
15	2
16	4
17	2
18	1
19	1
20	2
21	3
22	3
23	2
24	3
25	1
26	1
27	1
28	3
29	5
30	4
31	3
32	4
33	3
34	3
35	3
36	2
37	4
38	3
39	2
40	5
41	4
42	4
43	4
44	1
45	1
46	5
47	4
48	2
49	1
50	2
51	5
52	5
53	2
54	3
55	4
56	2
57	3
58	5
59	7
60	7
61	6
62	2
63	5
64	6
65	2
66	5
67	4
68	4
69	7
70	6
71	6
72	5
73	4
74	8
75	7
76	4
77	5
78	3
79	5
80	7
81	3
82	5
83	4
84	7
85	6
86	7
87	2

n	a(n)
1	0
2	1
3	0
4	2
5	1
6	2
7	1
8	0
9	0
10	2
11	2
12	4
13	1
14	1
15	2
16	4
17	2
18	1
19	1
20	2
21	3
22	3
23	2
24	3
25	1
26	1
27	1
28	3
29	5
30	4
31	3
32	4
33	3
34	3
35	3
36	2
37	4
38	3
39	2
40	5
41	4
42	4
43	4
44	1
45	1
46	5
47	4
48	2
49	1
50	2
51	5
52	5
53	2
54	3
55	4
56	2
57	3
58	5
59	7
60	7
61	6
62	2
63	5
64	6
65	2
66	5
67	4
68	4
69	7
70	6
71	6
72	5
73	4
74	8
75	7
76	4
77	5
78	3
79	5
80	7
81	3
82	5
83	4
84	7
85	6
86	7
87	2

n	a(n)
1	0
2	1
3	0
4	2
5	1
6	2
7	1
8	0
9	0
10	2
11	2
12	4
13	1
14	1
15	2
16	4
17	2
18	1
19	1
20	2
21	3
22	3
23	2
24	3
25	1
26	1
27	1
28	3
29	5
30	4
31	3
32	4
33	3
34	3
35	3
36	2
37	4
38	3
39	2
40	5
41	4
42	4
43	4
44	1
45	1
46	5
47	4
48	2
49	1
50	2
51	5
52	5
53	2
54	3
55	4
56	2
57	3
58	5
59	7
60	7
61	6
62	2
63	5
64	6
65	2
66	5
67	4
68	4
69	7
70	6
71	6
72	5
73	4
74	8
75	7
76	4
77	5
78	3
79	5
80	7
81	3
82	5
83	4
84	7
85	6
86	7
87	2