A187025 - cp's OEIS frontend

A187025 a(n) is the least number k such that k*n+1 is a prime dividing n^n-1.

n	a(n)
2	1
3	4
4	1
5	2
6	1
7	4
8	2
9	2
10	1
11	1436
12	1
13	4
14	501969
15	4
16	1
17	644
18	1
19	5784852794328402307380
20	2
21	2
22	1
23	20
24	3
25	4
26	36
27	4
28	1
29	2
30	1
31	18353950678197027912484562396837972855962080
32	8
33	2
34	3
35	8
36	1
37	4
38	5
39	4
40	1
41	2
42	1
43	4
44	2
45	4
46	1
47	36
48	2
49	4
50	3
51	128
52	1
53	2
54	5
55	85840
56	2
57	4
58	1
59	12
60	1
61	16
62	273

[1, 4, 1, 2, 1, 4, 2, 2, 1, 1436, 1, 4, 501969, 4, 1, 644, 1, 5784852794328402307380, 2, 2, 1, 20, 3, 4, 36, 4, 1, 2, 1, 18353950678197027912484562396837972855962080, 8, 2, 3, 8, 1, 4, 5, 4, 1, 2, 1, 4, 2, 4, 1, 36, 2, 4, 3, 128, 1, 2, 5, 85840, 2, 4, 1, 12, 1, 16, 273]

cp's OEIS Frontend

A187025 a(n) is the least number k such that k*n+1 is a prime dividing n^n-1.

Table of values

List of values