A366921 - cp's OEIS frontend

A366921 a(n) is the least prime factor > 3 of 10^n - 1.

n	a(n)
2	11
3	37
4	11
5	41
6	7
7	239
8	11
9	37
10	11
11	21649
12	7
13	53
14	11
15	31
16	11
17	2071723
18	7
19	1111111111111111111
20	11
21	37
22	11
23	11111111111111111111111
24	7
25	41
26	11
27	37
28	11
29	3191
30	7
31	2791
32	11
33	37
34	11
35	41
36	7
37	2028119
38	11
39	37
40	11
41	83
42	7
43	173
44	11
45	31
46	11
47	35121409
48	7
49	239
50	11
51	37
52	11
53	107

[11, 37, 11, 41, 7, 239, 11, 37, 11, 21649, 7, 53, 11, 31, 11, 2071723, 7, 1111111111111111111, 11, 37, 11, 11111111111111111111111, 7, 41, 11, 37, 11, 3191, 7, 2791, 11, 37, 11, 41, 7, 2028119, 11, 37, 11, 83, 7, 173, 11, 31, 11, 35121409, 7, 239, 11, 37, 11, 107]

cp's OEIS Frontend

A366921 a(n) is the least prime factor > 3 of 10^n - 1.

Table of values

List of values