A237715 - cp's OEIS frontend

A237715 Number of ordered ways to write n = p + q (q > 0) with p, prime(p) - p + 1 and prime(prime(q)) - prime(q) + 1 all prime.

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

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

cp's OEIS Frontend

A237715 Number of ordered ways to write n = p + q (q > 0) with p, prime(p) - p + 1 and prime(prime(q)) - prime(q) + 1 all prime.

Table of values

List of values

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

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

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