A208083 - cp's OEIS frontend

A208083 Number of primes of the form 2^n - 2^k - 1, 1 <= k < n.

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

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

cp's OEIS Frontend

A208083 Number of primes of the form 2^n - 2^k - 1, 1 <= k < n.

Table of values

List of values

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

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

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