A284950 - cp's OEIS frontend

A284950 Number of primes p <= n such that 2n-p and 2n+p are prime.

n	a(n)
1	0
2	0
3	0
4	1
5	1
6	1
7	1
8	1
9	1
10	1
11	0
12	2
13	1
14	0
15	3
16	0
17	1
18	3
19	0
20	1
21	3
22	1
23	0
24	3
25	1
26	0
27	3
28	1
29	0
30	5
31	0
32	1
33	4
34	0
35	1
36	3
37	0
38	1
39	4
40	0
41	0
42	4
43	1
44	0
45	6
46	0
47	0
48	4
49	0
50	1
51	2
52	1
53	1
54	4
55	1
56	0
57	4
58	0
59	0
60	9
61	0
62	0
63	5
64	0
65	0
66	5
67	1
68	0
69	4
70	0
71	0
72	5
73	0
74	0
75	6
76	0
77	1
78	5
79	0
80	1
81	5
82	0
83	0
84	7
85	1
86	0
87	5
88	1
89	0
90	7
91	0
92	0
93	6
94	0
95	0
96	4
97	1
98	1
99	4
100	0

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

cp's OEIS Frontend

A284950 Number of primes p <= n such that 2n-p and 2n+p are prime.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	1
5	1
6	1
7	1
8	1
9	1
10	1
11	0
12	2
13	1
14	0
15	3
16	0
17	1
18	3
19	0
20	1
21	3
22	1
23	0
24	3
25	1
26	0
27	3
28	1
29	0
30	5
31	0
32	1
33	4
34	0
35	1
36	3
37	0
38	1
39	4
40	0
41	0
42	4
43	1
44	0
45	6
46	0
47	0
48	4
49	0
50	1
51	2
52	1
53	1
54	4
55	1
56	0
57	4
58	0
59	0
60	9
61	0
62	0
63	5
64	0
65	0
66	5
67	1
68	0
69	4
70	0
71	0
72	5
73	0
74	0
75	6
76	0
77	1
78	5
79	0
80	1
81	5
82	0
83	0
84	7
85	1
86	0
87	5
88	1
89	0
90	7
91	0
92	0
93	6
94	0
95	0
96	4
97	1
98	1
99	4
100	0

n	a(n)
1	0
2	0
3	0
4	1
5	1
6	1
7	1
8	1
9	1
10	1
11	0
12	2
13	1
14	0
15	3
16	0
17	1
18	3
19	0
20	1
21	3
22	1
23	0
24	3
25	1
26	0
27	3
28	1
29	0
30	5
31	0
32	1
33	4
34	0
35	1
36	3
37	0
38	1
39	4
40	0
41	0
42	4
43	1
44	0
45	6
46	0
47	0
48	4
49	0
50	1
51	2
52	1
53	1
54	4
55	1
56	0
57	4
58	0
59	0
60	9
61	0
62	0
63	5
64	0
65	0
66	5
67	1
68	0
69	4
70	0
71	0
72	5
73	0
74	0
75	6
76	0
77	1
78	5
79	0
80	1
81	5
82	0
83	0
84	7
85	1
86	0
87	5
88	1
89	0
90	7
91	0
92	0
93	6
94	0
95	0
96	4
97	1
98	1
99	4
100	0

cp's OEIS Frontend

A284950 Number of primes p <= n such that 2*n-p and 2*n+p are prime.

Table of values

List of values

A284950 Number of primes p <= n such that 2n-p and 2n+p are prime.

n	a(n)
1	0
2	0
3	0
4	1
5	1
6	1
7	1
8	1
9	1
10	1
11	0
12	2
13	1
14	0
15	3
16	0
17	1
18	3
19	0
20	1
21	3
22	1
23	0
24	3
25	1
26	0
27	3
28	1
29	0
30	5
31	0
32	1
33	4
34	0
35	1
36	3
37	0
38	1
39	4
40	0
41	0
42	4
43	1
44	0
45	6
46	0
47	0
48	4
49	0
50	1
51	2
52	1
53	1
54	4
55	1
56	0
57	4
58	0
59	0
60	9
61	0
62	0
63	5
64	0
65	0
66	5
67	1
68	0
69	4
70	0
71	0
72	5
73	0
74	0
75	6
76	0
77	1
78	5
79	0
80	1
81	5
82	0
83	0
84	7
85	1
86	0
87	5
88	1
89	0
90	7
91	0
92	0
93	6
94	0
95	0
96	4
97	1
98	1
99	4
100	0