A234972 - cp's OEIS frontend

A234972 Least prime p < prime(n) such that 2^p - 1 is a primitive root modulo prime(n), or 0 if such a prime p does not exist.

n	a(n)
1	0
2	0
3	2
4	2
5	3
6	3
7	2
8	2
9	3
10	2
11	2
12	17
13	3
14	2
15	5
16	2
17	5
18	3
19	3
20	3
21	5
22	2
23	11
24	2
25	3
26	2
27	13
28	3
29	7
30	2
31	2
32	5
33	2
34	2
35	2
36	3
37	11
38	2
39	11
40	2
41	3
42	7
43	7
44	7
45	2
46	2
47	2
48	2
49	5
50	3
51	2
52	3
53	3
54	7
55	2
56	3
57	2
58	11
59	5
60	2
61	2
62	2
63	5
64	5
65	5
66	2
67	2
68	5
69	3
70	3
71	2
72	3
73	7
74	7
75	2
76	7
77	2
78	3
79	2
80	7
81	5
82	31
83	3
84	3
85	5
86	3
87	2
88	5
89	2
90	2
91	5
92	5
93	2
94	3
95	3
96	5
97	2
98	2
99	7
100	7

[0, 0, 2, 2, 3, 3, 2, 2, 3, 2, 2, 17, 3, 2, 5, 2, 5, 3, 3, 3, 5, 2, 11, 2, 3, 2, 13, 3, 7, 2, 2, 5, 2, 2, 2, 3, 11, 2, 11, 2, 3, 7, 7, 7, 2, 2, 2, 2, 5, 3, 2, 3, 3, 7, 2, 3, 2, 11, 5, 2, 2, 2, 5, 5, 5, 2, 2, 5, 3, 3, 2, 3, 7, 7, 2, 7, 2, 3, 2, 7, 5, 31, 3, 3, 5, 3, 2, 5, 2, 2, 5, 5, 2, 3, 3, 5, 2, 2, 7, 7]

cp's OEIS Frontend

A234972 Least prime p < prime(n) such that 2^p - 1 is a primitive root modulo prime(n), or 0 if such a prime p does not exist.

Table of values

List of values

n	a(n)
1	0
2	0
3	2
4	2
5	3
6	3
7	2
8	2
9	3
10	2
11	2
12	17
13	3
14	2
15	5
16	2
17	5
18	3
19	3
20	3
21	5
22	2
23	11
24	2
25	3
26	2
27	13
28	3
29	7
30	2
31	2
32	5
33	2
34	2
35	2
36	3
37	11
38	2
39	11
40	2
41	3
42	7
43	7
44	7
45	2
46	2
47	2
48	2
49	5
50	3
51	2
52	3
53	3
54	7
55	2
56	3
57	2
58	11
59	5
60	2
61	2
62	2
63	5
64	5
65	5
66	2
67	2
68	5
69	3
70	3
71	2
72	3
73	7
74	7
75	2
76	7
77	2
78	3
79	2
80	7
81	5
82	31
83	3
84	3
85	5
86	3
87	2
88	5
89	2
90	2
91	5
92	5
93	2
94	3
95	3
96	5
97	2
98	2
99	7
100	7

n	a(n)
1	0
2	0
3	2
4	2
5	3
6	3
7	2
8	2
9	3
10	2
11	2
12	17
13	3
14	2
15	5
16	2
17	5
18	3
19	3
20	3
21	5
22	2
23	11
24	2
25	3
26	2
27	13
28	3
29	7
30	2
31	2
32	5
33	2
34	2
35	2
36	3
37	11
38	2
39	11
40	2
41	3
42	7
43	7
44	7
45	2
46	2
47	2
48	2
49	5
50	3
51	2
52	3
53	3
54	7
55	2
56	3
57	2
58	11
59	5
60	2
61	2
62	2
63	5
64	5
65	5
66	2
67	2
68	5
69	3
70	3
71	2
72	3
73	7
74	7
75	2
76	7
77	2
78	3
79	2
80	7
81	5
82	31
83	3
84	3
85	5
86	3
87	2
88	5
89	2
90	2
91	5
92	5
93	2
94	3
95	3
96	5
97	2
98	2
99	7
100	7

n	a(n)
1	0
2	0
3	2
4	2
5	3
6	3
7	2
8	2
9	3
10	2
11	2
12	17
13	3
14	2
15	5
16	2
17	5
18	3
19	3
20	3
21	5
22	2
23	11
24	2
25	3
26	2
27	13
28	3
29	7
30	2
31	2
32	5
33	2
34	2
35	2
36	3
37	11
38	2
39	11
40	2
41	3
42	7
43	7
44	7
45	2
46	2
47	2
48	2
49	5
50	3
51	2
52	3
53	3
54	7
55	2
56	3
57	2
58	11
59	5
60	2
61	2
62	2
63	5
64	5
65	5
66	2
67	2
68	5
69	3
70	3
71	2
72	3
73	7
74	7
75	2
76	7
77	2
78	3
79	2
80	7
81	5
82	31
83	3
84	3
85	5
86	3
87	2
88	5
89	2
90	2
91	5
92	5
93	2
94	3
95	3
96	5
97	2
98	2
99	7
100	7