A084740 - cp's OEIS frontend

A084740 Least k such that (n^k-1)/(n-1) is prime, or 0 if no such prime exists.

n	a(n)
2	2
3	3
4	2
5	3
6	2
7	5
8	3
9	0
10	2
11	17
12	2
13	5
14	3
15	3
16	2
17	3
18	2
19	19
20	3
21	3
22	2
23	5
24	3
25	0
26	7
27	3
28	2
29	5
30	2
31	7
32	0
33	3
34	13
35	313
36	2
37	13
38	3
39	349
40	2
41	3
42	2
43	5
44	5
45	19
46	2
47	127
48	19
49	0
50	3
51	4229
52	2
53	11
54	3
55	17
56	7
57	3
58	2
59	3
60	2
61	7
62	3
63	5
64	0
65	19
66	2
67	19
68	5
69	3
70	2
71	3
72	2
73	5
74	5
75	3
76	41
77	3
78	2
79	5
80	3
81	0
82	2
83	5
84	17
85	5
86	11
87	7
88	2
89	3
90	3
91	4421
92	439
93	7
94	5
95	7
96	2
97	17
98	13
99	3
100	2
101	3
102	2
103	19
104	97
105	3
106	2
107	17
108	2
109	17
110	3
111	3
112	2
113	23
114	29
115	7
116	59

[2, 3, 2, 3, 2, 5, 3, 0, 2, 17, 2, 5, 3, 3, 2, 3, 2, 19, 3, 3, 2, 5, 3, 0, 7, 3, 2, 5, 2, 7, 0, 3, 13, 313, 2, 13, 3, 349, 2, 3, 2, 5, 5, 19, 2, 127, 19, 0, 3, 4229, 2, 11, 3, 17, 7, 3, 2, 3, 2, 7, 3, 5, 0, 19, 2, 19, 5, 3, 2, 3, 2, 5, 5, 3, 41, 3, 2, 5, 3, 0, 2, 5, 17, 5, 11, 7, 2, 3, 3, 4421, 439, 7, 5, 7, 2, 17, 13, 3, 2, 3, 2, 19, 97, 3, 2, 17, 2, 17, 3, 3, 2, 23, 29, 7, 59]

cp's OEIS Frontend

A084740 Least k such that (n^k-1)/(n-1) is prime, or 0 if no such prime exists.

Table of values

List of values