A186283 - cp's OEIS frontend

A186283 Least number k such that k*n+1 is a prime dividing 2^n-1.

n	a(n)
2	1
3	2
4	1
5	6
6	1
7	18
8	2
9	8
10	1
11	2
12	1
13	630
14	3
15	2
16	1
17	7710
18	1
19	27594
20	2
21	6
22	1
23	2
24	10
25	24
26	105
27	9728
28	1
29	8
30	1
31	69273666
32	8
33	18166
34	1285
35	2
36	1
37	6
38	4599
39	2
40	1
41	326
42	1
43	10
44	2
45	14
46	1
47	50
48	2
49	90462791808
50	5
51	2
52	1
53	120
54	1615
55	16
56	2
57	568
58	1
59	3050
60	1
61	37800705069076950
62	11545611
63	2
64	4
65	126
66	1
67	2891160
68	2
69	145690999102
70	1

[1, 2, 1, 6, 1, 18, 2, 8, 1, 2, 1, 630, 3, 2, 1, 7710, 1, 27594, 2, 6, 1, 2, 10, 24, 105, 9728, 1, 8, 1, 69273666, 8, 18166, 1285, 2, 1, 6, 4599, 2, 1, 326, 1, 10, 2, 14, 1, 50, 2, 90462791808, 5, 2, 1, 120, 1615, 16, 2, 568, 1, 3050, 1, 37800705069076950, 11545611, 2, 4, 126, 1, 2891160, 2, 145690999102, 1]

cp's OEIS Frontend

A186283 Least number k such that k*n+1 is a prime dividing 2^n-1.

Table of values

List of values