A292201 - cp's OEIS frontend

A292201 a(n) is the smallest value c such that prime(n)^c - 2 is prime, where prime(n) is the n-th prime or -1 if no such c exists.

n	a(n)
1	2
2	2
3	1
4	1
5	4
6	1
7	6
8	1
9	24
10	2
11	1
12	2
13	4
14	1
15	2
16	4
17	4
18	1
19	3
20	2
21	1
22	38
23	4
24	2
25	747
26	4
27	1
28	2
29	1
30	10
31	2
32	2
33	10
34	1
35	50
36	1
37	22
38	38
39	12
40	2
41	40
42	1
43	2
44	1
45	164
46	1
47	2
48	2
49	12
50	1
51	2
52	2
53	1
54	8
55	2
56	18
57	22
58	1
59	3
60	10
61	1
62	2
63	102
64	4
65	1
66	13896
67	12
68	2
69	1122
70	1

[2, 2, 1, 1, 4, 1, 6, 1, 24, 2, 1, 2, 4, 1, 2, 4, 4, 1, 3, 2, 1, 38, 4, 2, 747, 4, 1, 2, 1, 10, 2, 2, 10, 1, 50, 1, 22, 38, 12, 2, 40, 1, 2, 1, 164, 1, 2, 2, 12, 1, 2, 2, 1, 8, 2, 18, 22, 1, 3, 10, 1, 2, 102, 4, 1, 13896, 12, 2, 1122, 1]

cp's OEIS Frontend

A292201 a(n) is the smallest value c such that prime(n)^c - 2 is prime, where prime(n) is the n-th prime or -1 if no such c exists.

Table of values

List of values