A242248 - cp's OEIS frontend

A242248 a(n) = |{0 < g < prime(n): g, 2^g - 1 and (g-1)! are all primitive roots modulo prime(n)}|.

n	a(n)
1	1
2	0
3	1
4	1
5	1
6	1
7	3
8	1
9	1
10	2
11	1
12	2
13	2
14	1
15	6
16	2
17	10
18	3
19	2
20	3
21	5
22	2
23	10
24	12
25	3
26	6
27	7
28	15
29	3
30	9
31	3
32	8
33	18
34	5
35	18
36	3
37	7
38	7
39	24
40	20
41	26
42	4
43	13
44	10
45	15
46	5
47	4
48	3
49	35
50	5
51	19
52	19
53	3
54	19
55	36
56	37
57	38
58	5
59	10
60	15
61	16
62	34
63	7
64	16
65	6
66	36
67	4
68	4
69	44
70	14

[1, 0, 1, 1, 1, 1, 3, 1, 1, 2, 1, 2, 2, 1, 6, 2, 10, 3, 2, 3, 5, 2, 10, 12, 3, 6, 7, 15, 3, 9, 3, 8, 18, 5, 18, 3, 7, 7, 24, 20, 26, 4, 13, 10, 15, 5, 4, 3, 35, 5, 19, 19, 3, 19, 36, 37, 38, 5, 10, 15, 16, 34, 7, 16, 6, 36, 4, 4, 44, 14]

cp's OEIS Frontend

A242248 a(n) = |{0 < g < prime(n): g, 2^g - 1 and (g-1)! are all primitive roots modulo prime(n)}|.

Table of values

List of values

n	a(n)
1	1
2	0
3	1
4	1
5	1
6	1
7	3
8	1
9	1
10	2
11	1
12	2
13	2
14	1
15	6
16	2
17	10
18	3
19	2
20	3
21	5
22	2
23	10
24	12
25	3
26	6
27	7
28	15
29	3
30	9
31	3
32	8
33	18
34	5
35	18
36	3
37	7
38	7
39	24
40	20
41	26
42	4
43	13
44	10
45	15
46	5
47	4
48	3
49	35
50	5
51	19
52	19
53	3
54	19
55	36
56	37
57	38
58	5
59	10
60	15
61	16
62	34
63	7
64	16
65	6
66	36
67	4
68	4
69	44
70	14

n	a(n)
1	1
2	0
3	1
4	1
5	1
6	1
7	3
8	1
9	1
10	2
11	1
12	2
13	2
14	1
15	6
16	2
17	10
18	3
19	2
20	3
21	5
22	2
23	10
24	12
25	3
26	6
27	7
28	15
29	3
30	9
31	3
32	8
33	18
34	5
35	18
36	3
37	7
38	7
39	24
40	20
41	26
42	4
43	13
44	10
45	15
46	5
47	4
48	3
49	35
50	5
51	19
52	19
53	3
54	19
55	36
56	37
57	38
58	5
59	10
60	15
61	16
62	34
63	7
64	16
65	6
66	36
67	4
68	4
69	44
70	14

n	a(n)
1	1
2	0
3	1
4	1
5	1
6	1
7	3
8	1
9	1
10	2
11	1
12	2
13	2
14	1
15	6
16	2
17	10
18	3
19	2
20	3
21	5
22	2
23	10
24	12
25	3
26	6
27	7
28	15
29	3
30	9
31	3
32	8
33	18
34	5
35	18
36	3
37	7
38	7
39	24
40	20
41	26
42	4
43	13
44	10
45	15
46	5
47	4
48	3
49	35
50	5
51	19
52	19
53	3
54	19
55	36
56	37
57	38
58	5
59	10
60	15
61	16
62	34
63	7
64	16
65	6
66	36
67	4
68	4
69	44
70	14