A095389 - cp's OEIS frontend

A095389 a(n) is the number of residues from reduced residue system, R, modulo 210 such that both R and R+2 are primes, i.e., both 210n+r and 210n+r+2 are primes at fixed n.

n	a(n)
0	13
1	7
2	6
3	5
4	5
5	4
6	6
7	5
8	5
9	6
10	6
11	2
12	6
13	2
14	3
15	6
16	7
17	3
18	4
19	6
20	6
21	4
22	5
23	4
24	2
25	3
26	6
27	4
28	1
29	4
30	2
31	5
32	5
33	3
34	4
35	4
36	2
37	2
38	2
39	4
40	3
41	2
42	5
43	2
44	5
45	2
46	4
47	4
48	3
49	5
50	2
51	2
52	4
53	2
54	3
55	2
56	4
57	4
58	3
59	1
60	1
61	4
62	1
63	2
64	0
65	6
66	5
67	2
68	3
69	4
70	1
71	0
72	4
73	1
74	5
75	1
76	4
77	3
78	1
79	3
80	3
81	3
82	3
83	3
84	5
85	7
86	3
87	2
88	2
89	0
90	3
91	3
92	4
93	2
94	3
95	4
96	2
97	4
98	4
99	3
100	4
101	2
102	6
103	3
104	1

[13, 7, 6, 5, 5, 4, 6, 5, 5, 6, 6, 2, 6, 2, 3, 6, 7, 3, 4, 6, 6, 4, 5, 4, 2, 3, 6, 4, 1, 4, 2, 5, 5, 3, 4, 4, 2, 2, 2, 4, 3, 2, 5, 2, 5, 2, 4, 4, 3, 5, 2, 2, 4, 2, 3, 2, 4, 4, 3, 1, 1, 4, 1, 2, 0, 6, 5, 2, 3, 4, 1, 0, 4, 1, 5, 1, 4, 3, 1, 3, 3, 3, 3, 3, 5, 7, 3, 2, 2, 0, 3, 3, 4, 2, 3, 4, 2, 4, 4, 3, 4, 2, 6, 3, 1]

cp's OEIS Frontend

A095389 a(n) is the number of residues from reduced residue system, R, modulo 210 such that both R and R+2 are primes, i.e., both 210n+r and 210n+r+2 are primes at fixed n.

Table of values

List of values

n	a(n)
0	13
1	7
2	6
3	5
4	5
5	4
6	6
7	5
8	5
9	6
10	6
11	2
12	6
13	2
14	3
15	6
16	7
17	3
18	4
19	6
20	6
21	4
22	5
23	4
24	2
25	3
26	6
27	4
28	1
29	4
30	2
31	5
32	5
33	3
34	4
35	4
36	2
37	2
38	2
39	4
40	3
41	2
42	5
43	2
44	5
45	2
46	4
47	4
48	3
49	5
50	2
51	2
52	4
53	2
54	3
55	2
56	4
57	4
58	3
59	1
60	1
61	4
62	1
63	2
64	0
65	6
66	5
67	2
68	3
69	4
70	1
71	0
72	4
73	1
74	5
75	1
76	4
77	3
78	1
79	3
80	3
81	3
82	3
83	3
84	5
85	7
86	3
87	2
88	2
89	0
90	3
91	3
92	4
93	2
94	3
95	4
96	2
97	4
98	4
99	3
100	4
101	2
102	6
103	3
104	1

n	a(n)
0	13
1	7
2	6
3	5
4	5
5	4
6	6
7	5
8	5
9	6
10	6
11	2
12	6
13	2
14	3
15	6
16	7
17	3
18	4
19	6
20	6
21	4
22	5
23	4
24	2
25	3
26	6
27	4
28	1
29	4
30	2
31	5
32	5
33	3
34	4
35	4
36	2
37	2
38	2
39	4
40	3
41	2
42	5
43	2
44	5
45	2
46	4
47	4
48	3
49	5
50	2
51	2
52	4
53	2
54	3
55	2
56	4
57	4
58	3
59	1
60	1
61	4
62	1
63	2
64	0
65	6
66	5
67	2
68	3
69	4
70	1
71	0
72	4
73	1
74	5
75	1
76	4
77	3
78	1
79	3
80	3
81	3
82	3
83	3
84	5
85	7
86	3
87	2
88	2
89	0
90	3
91	3
92	4
93	2
94	3
95	4
96	2
97	4
98	4
99	3
100	4
101	2
102	6
103	3
104	1

n	a(n)
0	13
1	7
2	6
3	5
4	5
5	4
6	6
7	5
8	5
9	6
10	6
11	2
12	6
13	2
14	3
15	6
16	7
17	3
18	4
19	6
20	6
21	4
22	5
23	4
24	2
25	3
26	6
27	4
28	1
29	4
30	2
31	5
32	5
33	3
34	4
35	4
36	2
37	2
38	2
39	4
40	3
41	2
42	5
43	2
44	5
45	2
46	4
47	4
48	3
49	5
50	2
51	2
52	4
53	2
54	3
55	2
56	4
57	4
58	3
59	1
60	1
61	4
62	1
63	2
64	0
65	6
66	5
67	2
68	3
69	4
70	1
71	0
72	4
73	1
74	5
75	1
76	4
77	3
78	1
79	3
80	3
81	3
82	3
83	3
84	5
85	7
86	3
87	2
88	2
89	0
90	3
91	3
92	4
93	2
94	3
95	4
96	2
97	4
98	4
99	3
100	4
101	2
102	6
103	3
104	1