A227784 - cp's OEIS frontend

A227784 Least number of fourth powers which add to -1 mod n.

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

[0, 1, 2, 3, 4, 2, 2, 7, 2, 4, 2, 3, 2, 2, 4, 15, 1, 2, 2, 4, 2, 2, 2, 7, 4, 2, 2, 3, 3, 4, 2, 15, 2, 1, 4, 3, 2, 2, 2, 7, 1, 2, 2, 3, 4, 2, 2, 15, 2, 4, 2, 3, 2, 2, 4, 7, 2, 3, 2, 4, 2, 2, 2, 15, 4, 2, 2, 3, 2, 4, 2, 7, 1, 2, 4, 3, 2, 2, 2, 15, 2, 1, 2, 3, 4, 2, 3, 7, 1, 4, 2]

cp's OEIS Frontend

A227784 Least number of fourth powers which add to -1 mod n.

Table of values

List of values

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

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

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