A223942 - cp's OEIS frontend

A223942 Least prime q such that (x^{p_n}-1)/(x-1) is irreducible modulo q, where p_n is the n-th prime.

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

[2, 2, 2, 3, 2, 2, 3, 2, 5, 2, 3, 2, 7, 3, 5, 2, 2, 2, 2, 7, 5, 3, 2, 3, 5, 2, 5, 2, 11, 3, 3, 2, 3, 2, 2, 7, 5, 2, 5, 2, 2, 2, 19, 5, 2, 3, 2, 3, 2, 7, 3, 7, 7, 11, 3, 5, 2, 43, 5, 3]

cp's OEIS Frontend

A223942 Least prime q such that (x^{p_n}-1)/(x-1) is irreducible modulo q, where p_n is the n-th prime.

Table of values

List of values

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

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

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