A103961 - cp's OEIS frontend

A103961 Least k such that 2nk - 1 is a prime.

n	a(n)
1	2
2	1
3	1
4	1
5	2
6	1
7	1
8	2
9	1
10	1
11	2
12	1
13	4
14	3
15	1
16	1
17	2
18	2
19	1
20	2
21	1
22	1
23	3
24	1
25	3
26	2
27	1
28	3
29	3
30	1
31	1
32	2
33	2
34	1
35	2
36	1
37	1
38	2
39	3
40	1
41	2
42	1
43	3
44	3
45	1
46	4
47	3
48	2
49	1
50	2
51	1
52	1
53	2
54	1
55	1
56	2
57	1
58	3
59	3
60	2
61	4
62	5
63	2
64	1
65	3
66	1
67	3
68	2
69	1
70	1
71	2
72	3
73	7
74	3
75	1
76	1
77	2
78	2
79	1
80	3
81	4
82	1
83	2
84	1
85	3
86	5
87	1
88	7
89	8
90	1
91	1
92	2
93	3
94	3
95	2
96	1
97	1
98	3
99	1
100	1
101	5
102	5
103	3
104	5
105	2

[2, 1, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 4, 3, 1, 1, 2, 2, 1, 2, 1, 1, 3, 1, 3, 2, 1, 3, 3, 1, 1, 2, 2, 1, 2, 1, 1, 2, 3, 1, 2, 1, 3, 3, 1, 4, 3, 2, 1, 2, 1, 1, 2, 1, 1, 2, 1, 3, 3, 2, 4, 5, 2, 1, 3, 1, 3, 2, 1, 1, 2, 3, 7, 3, 1, 1, 2, 2, 1, 3, 4, 1, 2, 1, 3, 5, 1, 7, 8, 1, 1, 2, 3, 3, 2, 1, 1, 3, 1, 1, 5, 5, 3, 5, 2]

cp's OEIS Frontend

A103961 Least k such that 2nk - 1 is a prime.

Table of values

List of values

n	a(n)
1	2
2	1
3	1
4	1
5	2
6	1
7	1
8	2
9	1
10	1
11	2
12	1
13	4
14	3
15	1
16	1
17	2
18	2
19	1
20	2
21	1
22	1
23	3
24	1
25	3
26	2
27	1
28	3
29	3
30	1
31	1
32	2
33	2
34	1
35	2
36	1
37	1
38	2
39	3
40	1
41	2
42	1
43	3
44	3
45	1
46	4
47	3
48	2
49	1
50	2
51	1
52	1
53	2
54	1
55	1
56	2
57	1
58	3
59	3
60	2
61	4
62	5
63	2
64	1
65	3
66	1
67	3
68	2
69	1
70	1
71	2
72	3
73	7
74	3
75	1
76	1
77	2
78	2
79	1
80	3
81	4
82	1
83	2
84	1
85	3
86	5
87	1
88	7
89	8
90	1
91	1
92	2
93	3
94	3
95	2
96	1
97	1
98	3
99	1
100	1
101	5
102	5
103	3
104	5
105	2

n	a(n)
1	2
2	1
3	1
4	1
5	2
6	1
7	1
8	2
9	1
10	1
11	2
12	1
13	4
14	3
15	1
16	1
17	2
18	2
19	1
20	2
21	1
22	1
23	3
24	1
25	3
26	2
27	1
28	3
29	3
30	1
31	1
32	2
33	2
34	1
35	2
36	1
37	1
38	2
39	3
40	1
41	2
42	1
43	3
44	3
45	1
46	4
47	3
48	2
49	1
50	2
51	1
52	1
53	2
54	1
55	1
56	2
57	1
58	3
59	3
60	2
61	4
62	5
63	2
64	1
65	3
66	1
67	3
68	2
69	1
70	1
71	2
72	3
73	7
74	3
75	1
76	1
77	2
78	2
79	1
80	3
81	4
82	1
83	2
84	1
85	3
86	5
87	1
88	7
89	8
90	1
91	1
92	2
93	3
94	3
95	2
96	1
97	1
98	3
99	1
100	1
101	5
102	5
103	3
104	5
105	2

cp's OEIS Frontend

A103961 Least k such that 2*n*k - 1 is a prime.

Table of values

List of values

A103961 Least k such that 2nk - 1 is a prime.

n	a(n)
1	2
2	1
3	1
4	1
5	2
6	1
7	1
8	2
9	1
10	1
11	2
12	1
13	4
14	3
15	1
16	1
17	2
18	2
19	1
20	2
21	1
22	1
23	3
24	1
25	3
26	2
27	1
28	3
29	3
30	1
31	1
32	2
33	2
34	1
35	2
36	1
37	1
38	2
39	3
40	1
41	2
42	1
43	3
44	3
45	1
46	4
47	3
48	2
49	1
50	2
51	1
52	1
53	2
54	1
55	1
56	2
57	1
58	3
59	3
60	2
61	4
62	5
63	2
64	1
65	3
66	1
67	3
68	2
69	1
70	1
71	2
72	3
73	7
74	3
75	1
76	1
77	2
78	2
79	1
80	3
81	4
82	1
83	2
84	1
85	3
86	5
87	1
88	7
89	8
90	1
91	1
92	2
93	3
94	3
95	2
96	1
97	1
98	3
99	1
100	1
101	5
102	5
103	3
104	5
105	2