A261627 - cp's OEIS frontend

A261627 Number of primes p such that n-(pn'-1) and n+(pn'-1) are both prime, where n' is 1 or 2 according as n is odd or even.

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

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

cp's OEIS Frontend

A261627 Number of primes p such that n-(pn'-1) and n+(pn'-1) are both prime, where n' is 1 or 2 according as n is odd or even.

Table of values

List of values

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

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

cp's OEIS Frontend

A261627 Number of primes p such that n-(p*n'-1) and n+(p*n'-1) are both prime, where n' is 1 or 2 according as n is odd or even.

Table of values

List of values

A261627 Number of primes p such that n-(pn'-1) and n+(pn'-1) are both prime, where n' is 1 or 2 according as n is odd or even.

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