A087139 - cp's OEIS frontend

A087139 Least k>1 such that p^k - p^(k-1) + 1 is prime for p = prime(n).

n	a(n)
1	2
2	2
3	3
4	2
5	11
6	2
7	5
8	30
9	15
10	3
11	6
12	10
13	81
14	3
15	17
16	961
17	15
18	7
19	2
20	5
21	6
22	2
23	3
24	3
25	12
26	3
27	57
28	5
29	16
30	5
31	166
32	15
33	13
34	2
35	3
36	2
37	30
38	2
39	25
40	3
41	47
42	3
43	3
44	2
45	521
46	9
47	3
48	15
49	17
50	42
51	17
52	51
53	39

[2, 2, 3, 2, 11, 2, 5, 30, 15, 3, 6, 10, 81, 3, 17, 961, 15, 7, 2, 5, 6, 2, 3, 3, 12, 3, 57, 5, 16, 5, 166, 15, 13, 2, 3, 2, 30, 2, 25, 3, 47, 3, 3, 2, 521, 9, 3, 15, 17, 42, 17, 51, 39]

cp's OEIS Frontend

A087139 Least k>1 such that p^k - p^(k-1) + 1 is prime for p = prime(n).

Table of values

List of values

n	a(n)
1	2
2	2
3	3
4	2
5	11
6	2
7	5
8	30
9	15
10	3
11	6
12	10
13	81
14	3
15	17
16	961
17	15
18	7
19	2
20	5
21	6
22	2
23	3
24	3
25	12
26	3
27	57
28	5
29	16
30	5
31	166
32	15
33	13
34	2
35	3
36	2
37	30
38	2
39	25
40	3
41	47
42	3
43	3
44	2
45	521
46	9
47	3
48	15
49	17
50	42
51	17
52	51
53	39

n	a(n)
1	2
2	2
3	3
4	2
5	11
6	2
7	5
8	30
9	15
10	3
11	6
12	10
13	81
14	3
15	17
16	961
17	15
18	7
19	2
20	5
21	6
22	2
23	3
24	3
25	12
26	3
27	57
28	5
29	16
30	5
31	166
32	15
33	13
34	2
35	3
36	2
37	30
38	2
39	25
40	3
41	47
42	3
43	3
44	2
45	521
46	9
47	3
48	15
49	17
50	42
51	17
52	51
53	39

n	a(n)
1	2
2	2
3	3
4	2
5	11
6	2
7	5
8	30
9	15
10	3
11	6
12	10
13	81
14	3
15	17
16	961
17	15
18	7
19	2
20	5
21	6
22	2
23	3
24	3
25	12
26	3
27	57
28	5
29	16
30	5
31	166
32	15
33	13
34	2
35	3
36	2
37	30
38	2
39	25
40	3
41	47
42	3
43	3
44	2
45	521
46	9
47	3
48	15
49	17
50	42
51	17
52	51
53	39