A122396 - cp's OEIS frontend

A122396 Least k>1 such that p^k - p^(k-1) - 1 is prime for p = prime(n).

n	a(n)
1	3
2	2
3	2
4	2
5	2
6	3
7	2
8	7
9	56
10	2
11	2
12	8
13	8
14	8
15	2
16	4
17	4
18	2
19	2
20	2
21	9
22	3
23	21496
24	26
25	2
26	2
27	4
28	38
29	7
30	286644
31	2
32	2
33	26
34	2
35	2
36	4
37	4
38	15
39	4
40	24
41	16
42	2
43	264
44	4
45	2
46	3
47	24
48	3
49	516
50	6

[3, 2, 2, 2, 2, 3, 2, 7, 56, 2, 2, 8, 8, 8, 2, 4, 4, 2, 2, 2, 9, 3, 21496, 26, 2, 2, 4, 38, 7, 286644, 2, 2, 26, 2, 2, 4, 4, 15, 4, 24, 16, 2, 264, 4, 2, 3, 24, 3, 516, 6]

cp's OEIS Frontend

A122396 Least k>1 such that p^k - p^(k-1) - 1 is prime for p = prime(n).

Table of values

List of values