A307865 - cp's OEIS frontend

A307865 a(n) is the number of natural bases b < 2n+1 such that b^n == -1 (mod 2n+1).

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

[0, 1, 2, 3, 0, 5, 6, 1, 8, 9, 0, 11, 0, 1, 14, 15, 0, 1, 18, 1, 20, 21, 0, 23, 0, 1, 26, 1, 0, 29, 30, 1, 0, 33, 0, 35, 36, 1, 0, 39, 0, 41, 4, 1, 44, 9, 0, 1, 48, 1, 50, 51, 0, 53, 54, 1, 56, 1, 0, 1, 0, 1, 2, 63, 0, 65, 0, 1, 68, 69, 0, 1, 0, 1, 74, 75, 0, 1, 78, 1, 0, 81, 0, 83, 0, 1, 86]

cp's OEIS Frontend

A307865 a(n) is the number of natural bases b < 2n+1 such that b^n == -1 (mod 2n+1).

Table of values

List of values

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

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

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