A178250 - cp's OEIS frontend

A178250 Least number x such that n^x-n-1 is prime.

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

[3, 2, 2, 2, 2, 2, 3, 2, 2, 2, 2, 4, 2, 3, 2, 2, 3, 5, 2, 2, 2, 3, 3, 2, 4, 2, 5, 2, 5, 2, 2, 7, 5, 3, 2, 9, 3, 2, 2, 3, 2, 31, 4, 2, 2, 2, 3, 2, 4, 2, 108, 4, 2, 2, 2, 2, 3, 3, 2, 2, 18, 7, 3, 2, 2, 2, 4, 2, 3, 2, 5, 32, 108, 5, 3, 2, 11, 4, 15, 3, 4, 19, 2, 6, 2, 2, 11, 107, 2, 42, 4, 39, 2, 2, 6, 2, 3]

cp's OEIS Frontend

A178250 Least number x such that n^x-n-1 is prime.

Table of values

List of values

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

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

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