A122170 - cp's OEIS frontend

A122170 Number of primes p <= 2n such that p+n is also a prime.

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	3
7	0
8	3
9	1
10	4
11	1
12	5
13	0
14	4
15	1
16	4
17	1
18	6
19	0
20	4
21	1
22	4
23	0
24	10
25	0
26	6
27	1
28	5
29	1
30	12
31	0
32	5
33	0
34	6
35	1
36	13
37	0
38	7
39	1
40	9
41	1
42	13
43	0
44	7
45	1
46	6
47	0
48	13
49	0
50	9
51	1
52	7
53	0
54	14
55	0
56	12
57	1
58	7
59	1
60	19
61	0
62	7
63	0
64	10
65	1
66	20
67	0
68	11
69	1
70	13
71	1
72	15
73	0
74	8
75	0
76	10
77	1
78	18
79	0
80	12
81	1
82	8
83	0
84	23
85	0
86	10
87	1
88	10
89	0
90	26
91	0
92	13
93	0
94	13

[1, 1, 1, 2, 1, 3, 0, 3, 1, 4, 1, 5, 0, 4, 1, 4, 1, 6, 0, 4, 1, 4, 0, 10, 0, 6, 1, 5, 1, 12, 0, 5, 0, 6, 1, 13, 0, 7, 1, 9, 1, 13, 0, 7, 1, 6, 0, 13, 0, 9, 1, 7, 0, 14, 0, 12, 1, 7, 1, 19, 0, 7, 0, 10, 1, 20, 0, 11, 1, 13, 1, 15, 0, 8, 0, 10, 1, 18, 0, 12, 1, 8, 0, 23, 0, 10, 1, 10, 0, 26, 0, 13, 0, 13]

cp's OEIS Frontend

A122170 Number of primes p <= 2n such that p+n is also a prime.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	3
7	0
8	3
9	1
10	4
11	1
12	5
13	0
14	4
15	1
16	4
17	1
18	6
19	0
20	4
21	1
22	4
23	0
24	10
25	0
26	6
27	1
28	5
29	1
30	12
31	0
32	5
33	0
34	6
35	1
36	13
37	0
38	7
39	1
40	9
41	1
42	13
43	0
44	7
45	1
46	6
47	0
48	13
49	0
50	9
51	1
52	7
53	0
54	14
55	0
56	12
57	1
58	7
59	1
60	19
61	0
62	7
63	0
64	10
65	1
66	20
67	0
68	11
69	1
70	13
71	1
72	15
73	0
74	8
75	0
76	10
77	1
78	18
79	0
80	12
81	1
82	8
83	0
84	23
85	0
86	10
87	1
88	10
89	0
90	26
91	0
92	13
93	0
94	13

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	3
7	0
8	3
9	1
10	4
11	1
12	5
13	0
14	4
15	1
16	4
17	1
18	6
19	0
20	4
21	1
22	4
23	0
24	10
25	0
26	6
27	1
28	5
29	1
30	12
31	0
32	5
33	0
34	6
35	1
36	13
37	0
38	7
39	1
40	9
41	1
42	13
43	0
44	7
45	1
46	6
47	0
48	13
49	0
50	9
51	1
52	7
53	0
54	14
55	0
56	12
57	1
58	7
59	1
60	19
61	0
62	7
63	0
64	10
65	1
66	20
67	0
68	11
69	1
70	13
71	1
72	15
73	0
74	8
75	0
76	10
77	1
78	18
79	0
80	12
81	1
82	8
83	0
84	23
85	0
86	10
87	1
88	10
89	0
90	26
91	0
92	13
93	0
94	13

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	3
7	0
8	3
9	1
10	4
11	1
12	5
13	0
14	4
15	1
16	4
17	1
18	6
19	0
20	4
21	1
22	4
23	0
24	10
25	0
26	6
27	1
28	5
29	1
30	12
31	0
32	5
33	0
34	6
35	1
36	13
37	0
38	7
39	1
40	9
41	1
42	13
43	0
44	7
45	1
46	6
47	0
48	13
49	0
50	9
51	1
52	7
53	0
54	14
55	0
56	12
57	1
58	7
59	1
60	19
61	0
62	7
63	0
64	10
65	1
66	20
67	0
68	11
69	1
70	13
71	1
72	15
73	0
74	8
75	0
76	10
77	1
78	18
79	0
80	12
81	1
82	8
83	0
84	23
85	0
86	10
87	1
88	10
89	0
90	26
91	0
92	13
93	0
94	13