A119591 - cp's OEIS frontend

A119591 Least k such that 2*n^k - 1 is prime.

n	a(n)
2	1
3	1
4	1
5	4
6	1
7	1
8	2
9	1
10	1
11	2
12	1
13	2
14	4
15	1
16	1
17	2
18	2
19	1
20	10
21	1
22	1
23	6
24	1
25	2
26	6
27	1
28	2
29	136
30	1
31	1
32	6
33	6
34	1
35	6
36	1
37	1
38	2
39	2
40	1
41	2
42	1
43	2
44	4
45	1
46	2
47	4
48	4
49	1
50	2
51	1
52	1
53	44
54	1
55	1
56	2
57	1
58	3
59	2
60	5
61	3
62	2
63	2
64	1
65	4
66	1
67	768
68	4
69	1
70	1
71	52
72	34
73	2
74	132
75	1
76	1
77	14
78	7
79	1
80	2
81	2
82	1
83	8
84	1
85	2
86	10
87	1
88	24
89	60
90	1
91	1
92	2
93	3
94	5
95	2
96	1
97	1
98	2
99	1
100	1

[1, 1, 1, 4, 1, 1, 2, 1, 1, 2, 1, 2, 4, 1, 1, 2, 2, 1, 10, 1, 1, 6, 1, 2, 6, 1, 2, 136, 1, 1, 6, 6, 1, 6, 1, 1, 2, 2, 1, 2, 1, 2, 4, 1, 2, 4, 4, 1, 2, 1, 1, 44, 1, 1, 2, 1, 3, 2, 5, 3, 2, 2, 1, 4, 1, 768, 4, 1, 1, 52, 34, 2, 132, 1, 1, 14, 7, 1, 2, 2, 1, 8, 1, 2, 10, 1, 24, 60, 1, 1, 2, 3, 5, 2, 1, 1, 2, 1, 1]

cp's OEIS Frontend

A119591 Least k such that 2*n^k - 1 is prime.

Table of values

List of values

n	a(n)
2	1
3	1
4	1
5	4
6	1
7	1
8	2
9	1
10	1
11	2
12	1
13	2
14	4
15	1
16	1
17	2
18	2
19	1
20	10
21	1
22	1
23	6
24	1
25	2
26	6
27	1
28	2
29	136
30	1
31	1
32	6
33	6
34	1
35	6
36	1
37	1
38	2
39	2
40	1
41	2
42	1
43	2
44	4
45	1
46	2
47	4
48	4
49	1
50	2
51	1
52	1
53	44
54	1
55	1
56	2
57	1
58	3
59	2
60	5
61	3
62	2
63	2
64	1
65	4
66	1
67	768
68	4
69	1
70	1
71	52
72	34
73	2
74	132
75	1
76	1
77	14
78	7
79	1
80	2
81	2
82	1
83	8
84	1
85	2
86	10
87	1
88	24
89	60
90	1
91	1
92	2
93	3
94	5
95	2
96	1
97	1
98	2
99	1
100	1

n	a(n)
2	1
3	1
4	1
5	4
6	1
7	1
8	2
9	1
10	1
11	2
12	1
13	2
14	4
15	1
16	1
17	2
18	2
19	1
20	10
21	1
22	1
23	6
24	1
25	2
26	6
27	1
28	2
29	136
30	1
31	1
32	6
33	6
34	1
35	6
36	1
37	1
38	2
39	2
40	1
41	2
42	1
43	2
44	4
45	1
46	2
47	4
48	4
49	1
50	2
51	1
52	1
53	44
54	1
55	1
56	2
57	1
58	3
59	2
60	5
61	3
62	2
63	2
64	1
65	4
66	1
67	768
68	4
69	1
70	1
71	52
72	34
73	2
74	132
75	1
76	1
77	14
78	7
79	1
80	2
81	2
82	1
83	8
84	1
85	2
86	10
87	1
88	24
89	60
90	1
91	1
92	2
93	3
94	5
95	2
96	1
97	1
98	2
99	1
100	1

n	a(n)
2	1
3	1
4	1
5	4
6	1
7	1
8	2
9	1
10	1
11	2
12	1
13	2
14	4
15	1
16	1
17	2
18	2
19	1
20	10
21	1
22	1
23	6
24	1
25	2
26	6
27	1
28	2
29	136
30	1
31	1
32	6
33	6
34	1
35	6
36	1
37	1
38	2
39	2
40	1
41	2
42	1
43	2
44	4
45	1
46	2
47	4
48	4
49	1
50	2
51	1
52	1
53	44
54	1
55	1
56	2
57	1
58	3
59	2
60	5
61	3
62	2
63	2
64	1
65	4
66	1
67	768
68	4
69	1
70	1
71	52
72	34
73	2
74	132
75	1
76	1
77	14
78	7
79	1
80	2
81	2
82	1
83	8
84	1
85	2
86	10
87	1
88	24
89	60
90	1
91	1
92	2
93	3
94	5
95	2
96	1
97	1
98	2
99	1
100	1