A240659 - cp's OEIS frontend

A240659 Least k such that 4^k == -1 (mod prime(n)), or 0 if no such k exists.

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

[0, 0, 1, 0, 0, 3, 2, 0, 0, 7, 0, 9, 5, 0, 0, 13, 0, 15, 0, 0, 0, 0, 0, 0, 12, 25, 0, 0, 9, 7, 0, 0, 17, 0, 37, 0, 13, 0, 0, 43, 0, 45, 0, 24, 49, 0, 0, 0, 0, 19, 0, 0, 6, 0, 4, 0, 67, 0, 23, 0, 0, 73, 0, 0, 39, 79, 0, 0, 0, 87, 22, 0, 0, 93, 0, 0, 97, 11, 50, 51]

cp's OEIS Frontend

A240659 Least k such that 4^k == -1 (mod prime(n)), or 0 if no such k exists.

Table of values

List of values

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

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

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