A186522 - cp's OEIS frontend

A186522 Smallest prime factor of 2^n - 1 having the form k*n + 1.

n	a(n)
2	3
3	7
4	5
5	31
6	7
7	127
8	17
9	73
10	11
11	23
12	13
13	8191
14	43
15	31
16	17
17	131071
18	19
19	524287
20	41
21	127
22	23
23	47
24	241
25	601
26	2731
27	262657
28	29
29	233
30	31
31	2147483647
32	257
33	599479
34	43691
35	71
36	37
37	223
38	174763
39	79
40	41
41	13367
42	43
43	431
44	89
45	631
46	47
47	2351
48	97
49	4432676798593
50	251
51	103
52	53
53	6361
54	87211
55	881
56	113
57	32377
58	59
59	179951
60	61

[3, 7, 5, 31, 7, 127, 17, 73, 11, 23, 13, 8191, 43, 31, 17, 131071, 19, 524287, 41, 127, 23, 47, 241, 601, 2731, 262657, 29, 233, 31, 2147483647, 257, 599479, 43691, 71, 37, 223, 174763, 79, 41, 13367, 43, 431, 89, 631, 47, 2351, 97, 4432676798593, 251, 103, 53, 6361, 87211, 881, 113, 32377, 59, 179951, 61]

cp's OEIS Frontend

A186522 Smallest prime factor of 2^n - 1 having the form k*n + 1.

Table of values

List of values