A078178 - cp's OEIS frontend

A078178 Least k>=2 such that n^k + n - 1 is prime.

n	a(n)
2	2
3	2
4	2
5	2
6	2
7	3
8	2
9	2
10	2
11	2
12	4
13	2
14	16
15	2
16	2
17	4
18	3
19	2
20	2
21	2
22	7
23	4
24	2
25	3
26	2
27	3
28	2
29	10
30	2
31	2
32	108
33	3
34	6
35	2
36	3
37	7
38	2
39	2
40	4
41	2
42	16
43	3
44	2
45	2
46	2
47	20
48	2
49	7
50	2
51	3
52	3
53	2
54	2
55	2
56	2
57	9
58	4
59	2
60	2
61	7
62	8
63	3
64	2
65	2
66	2
67	24
68	2
69	6
70	2
71	12
72	4
73	3
74	8
75	6
76	2
77	4
78	3
79	9
80	194
81	3
82	13
83	2
84	8
85	2
86	2
87	3
88	8
89	2
90	10
91	6
92	4
93	2
94	2
95	54
96	2
97	132
98	4
99	10
100	2

[2, 2, 2, 2, 2, 3, 2, 2, 2, 2, 4, 2, 16, 2, 2, 4, 3, 2, 2, 2, 7, 4, 2, 3, 2, 3, 2, 10, 2, 2, 108, 3, 6, 2, 3, 7, 2, 2, 4, 2, 16, 3, 2, 2, 2, 20, 2, 7, 2, 3, 3, 2, 2, 2, 2, 9, 4, 2, 2, 7, 8, 3, 2, 2, 2, 24, 2, 6, 2, 12, 4, 3, 8, 6, 2, 4, 3, 9, 194, 3, 13, 2, 8, 2, 2, 3, 8, 2, 10, 6, 4, 2, 2, 54, 2, 132, 4, 10, 2]

cp's OEIS Frontend

A078178 Least k>=2 such that n^k + n - 1 is prime.

Table of values

List of values

n	a(n)
2	2
3	2
4	2
5	2
6	2
7	3
8	2
9	2
10	2
11	2
12	4
13	2
14	16
15	2
16	2
17	4
18	3
19	2
20	2
21	2
22	7
23	4
24	2
25	3
26	2
27	3
28	2
29	10
30	2
31	2
32	108
33	3
34	6
35	2
36	3
37	7
38	2
39	2
40	4
41	2
42	16
43	3
44	2
45	2
46	2
47	20
48	2
49	7
50	2
51	3
52	3
53	2
54	2
55	2
56	2
57	9
58	4
59	2
60	2
61	7
62	8
63	3
64	2
65	2
66	2
67	24
68	2
69	6
70	2
71	12
72	4
73	3
74	8
75	6
76	2
77	4
78	3
79	9
80	194
81	3
82	13
83	2
84	8
85	2
86	2
87	3
88	8
89	2
90	10
91	6
92	4
93	2
94	2
95	54
96	2
97	132
98	4
99	10
100	2

n	a(n)
2	2
3	2
4	2
5	2
6	2
7	3
8	2
9	2
10	2
11	2
12	4
13	2
14	16
15	2
16	2
17	4
18	3
19	2
20	2
21	2
22	7
23	4
24	2
25	3
26	2
27	3
28	2
29	10
30	2
31	2
32	108
33	3
34	6
35	2
36	3
37	7
38	2
39	2
40	4
41	2
42	16
43	3
44	2
45	2
46	2
47	20
48	2
49	7
50	2
51	3
52	3
53	2
54	2
55	2
56	2
57	9
58	4
59	2
60	2
61	7
62	8
63	3
64	2
65	2
66	2
67	24
68	2
69	6
70	2
71	12
72	4
73	3
74	8
75	6
76	2
77	4
78	3
79	9
80	194
81	3
82	13
83	2
84	8
85	2
86	2
87	3
88	8
89	2
90	10
91	6
92	4
93	2
94	2
95	54
96	2
97	132
98	4
99	10
100	2

n	a(n)
2	2
3	2
4	2
5	2
6	2
7	3
8	2
9	2
10	2
11	2
12	4
13	2
14	16
15	2
16	2
17	4
18	3
19	2
20	2
21	2
22	7
23	4
24	2
25	3
26	2
27	3
28	2
29	10
30	2
31	2
32	108
33	3
34	6
35	2
36	3
37	7
38	2
39	2
40	4
41	2
42	16
43	3
44	2
45	2
46	2
47	20
48	2
49	7
50	2
51	3
52	3
53	2
54	2
55	2
56	2
57	9
58	4
59	2
60	2
61	7
62	8
63	3
64	2
65	2
66	2
67	24
68	2
69	6
70	2
71	12
72	4
73	3
74	8
75	6
76	2
77	4
78	3
79	9
80	194
81	3
82	13
83	2
84	8
85	2
86	2
87	3
88	8
89	2
90	10
91	6
92	4
93	2
94	2
95	54
96	2
97	132
98	4
99	10
100	2