A279027 - cp's OEIS frontend

A279027 a(n) = number of primes of the form 4k + 3 such that 2n - 4k - 3 is prime.

n	a(n)
1	0
2	0
3	1
4	1
5	2
6	1
7	3
8	2
9	2
10	2
11	3
12	3
13	4
14	2
15	4
16	2
17	4
18	4
19	3
20	3
21	4
22	3
23	3
24	5
25	6
26	3
27	6
28	3
29	2
30	6
31	5
32	5
33	6
34	2
35	6
36	6
37	6
38	5
39	8
40	4
41	6
42	8
43	7
44	4
45	12
46	4
47	5
48	7
49	4
50	6
51	8
52	5
53	6
54	8
55	8
56	7
57	10
58	6
59	5
60	12
61	4
62	5
63	10
64	3
65	8
66	9
67	7
68	5
69	10
70	7
71	7
72	11
73	8
74	5
75	14
76	4
77	8
78	11
79	7
80	8
81	10
82	5
83	5
84	13
85	12
86	6
87	14
88	7
89	6
90	14
91	10
92	8
93	14

[0, 0, 1, 1, 2, 1, 3, 2, 2, 2, 3, 3, 4, 2, 4, 2, 4, 4, 3, 3, 4, 3, 3, 5, 6, 3, 6, 3, 2, 6, 5, 5, 6, 2, 6, 6, 6, 5, 8, 4, 6, 8, 7, 4, 12, 4, 5, 7, 4, 6, 8, 5, 6, 8, 8, 7, 10, 6, 5, 12, 4, 5, 10, 3, 8, 9, 7, 5, 10, 7, 7, 11, 8, 5, 14, 4, 8, 11, 7, 8, 10, 5, 5, 13, 12, 6, 14, 7, 6, 14, 10, 8, 14]

cp's OEIS Frontend

A279027 a(n) = number of primes of the form 4k + 3 such that 2n - 4k - 3 is prime.

Table of values

List of values

n	a(n)
1	0
2	0
3	1
4	1
5	2
6	1
7	3
8	2
9	2
10	2
11	3
12	3
13	4
14	2
15	4
16	2
17	4
18	4
19	3
20	3
21	4
22	3
23	3
24	5
25	6
26	3
27	6
28	3
29	2
30	6
31	5
32	5
33	6
34	2
35	6
36	6
37	6
38	5
39	8
40	4
41	6
42	8
43	7
44	4
45	12
46	4
47	5
48	7
49	4
50	6
51	8
52	5
53	6
54	8
55	8
56	7
57	10
58	6
59	5
60	12
61	4
62	5
63	10
64	3
65	8
66	9
67	7
68	5
69	10
70	7
71	7
72	11
73	8
74	5
75	14
76	4
77	8
78	11
79	7
80	8
81	10
82	5
83	5
84	13
85	12
86	6
87	14
88	7
89	6
90	14
91	10
92	8
93	14

n	a(n)
1	0
2	0
3	1
4	1
5	2
6	1
7	3
8	2
9	2
10	2
11	3
12	3
13	4
14	2
15	4
16	2
17	4
18	4
19	3
20	3
21	4
22	3
23	3
24	5
25	6
26	3
27	6
28	3
29	2
30	6
31	5
32	5
33	6
34	2
35	6
36	6
37	6
38	5
39	8
40	4
41	6
42	8
43	7
44	4
45	12
46	4
47	5
48	7
49	4
50	6
51	8
52	5
53	6
54	8
55	8
56	7
57	10
58	6
59	5
60	12
61	4
62	5
63	10
64	3
65	8
66	9
67	7
68	5
69	10
70	7
71	7
72	11
73	8
74	5
75	14
76	4
77	8
78	11
79	7
80	8
81	10
82	5
83	5
84	13
85	12
86	6
87	14
88	7
89	6
90	14
91	10
92	8
93	14

n	a(n)
1	0
2	0
3	1
4	1
5	2
6	1
7	3
8	2
9	2
10	2
11	3
12	3
13	4
14	2
15	4
16	2
17	4
18	4
19	3
20	3
21	4
22	3
23	3
24	5
25	6
26	3
27	6
28	3
29	2
30	6
31	5
32	5
33	6
34	2
35	6
36	6
37	6
38	5
39	8
40	4
41	6
42	8
43	7
44	4
45	12
46	4
47	5
48	7
49	4
50	6
51	8
52	5
53	6
54	8
55	8
56	7
57	10
58	6
59	5
60	12
61	4
62	5
63	10
64	3
65	8
66	9
67	7
68	5
69	10
70	7
71	7
72	11
73	8
74	5
75	14
76	4
77	8
78	11
79	7
80	8
81	10
82	5
83	5
84	13
85	12
86	6
87	14
88	7
89	6
90	14
91	10
92	8
93	14