A240657 - cp's OEIS frontend

A240657 Least k such that 2^k == -1 (mod prime(n)), or 0 if no such k exists.

n	a(n)
1	0
2	1
3	2
4	0
5	5
6	6
7	4
8	9
9	0
10	14
11	0
12	18
13	10
14	7
15	0
16	26
17	29
18	30
19	33
20	0
21	0
22	0
23	41
24	0
25	24
26	50
27	0
28	53
29	18
30	14
31	0
32	65
33	34
34	69
35	74
36	0
37	26
38	81
39	0
40	86
41	89
42	90
43	0
44	48
45	98
46	0
47	105
48	0
49	113
50	38
51	0
52	0
53	12
54	25
55	8
56	0
57	134
58	0
59	46
60	35
61	47
62	146
63	51
64	0
65	78
66	158
67	15
68	0
69	173
70	174
71	44
72	0

[0, 1, 2, 0, 5, 6, 4, 9, 0, 14, 0, 18, 10, 7, 0, 26, 29, 30, 33, 0, 0, 0, 41, 0, 24, 50, 0, 53, 18, 14, 0, 65, 34, 69, 74, 0, 26, 81, 0, 86, 89, 90, 0, 48, 98, 0, 105, 0, 113, 38, 0, 0, 12, 25, 8, 0, 134, 0, 46, 35, 47, 146, 51, 0, 78, 158, 15, 0, 173, 174, 44, 0]

cp's OEIS Frontend

A240657 Least k such that 2^k == -1 (mod prime(n)), or 0 if no such k exists.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	0
5	5
6	6
7	4
8	9
9	0
10	14
11	0
12	18
13	10
14	7
15	0
16	26
17	29
18	30
19	33
20	0
21	0
22	0
23	41
24	0
25	24
26	50
27	0
28	53
29	18
30	14
31	0
32	65
33	34
34	69
35	74
36	0
37	26
38	81
39	0
40	86
41	89
42	90
43	0
44	48
45	98
46	0
47	105
48	0
49	113
50	38
51	0
52	0
53	12
54	25
55	8
56	0
57	134
58	0
59	46
60	35
61	47
62	146
63	51
64	0
65	78
66	158
67	15
68	0
69	173
70	174
71	44
72	0

n	a(n)
1	0
2	1
3	2
4	0
5	5
6	6
7	4
8	9
9	0
10	14
11	0
12	18
13	10
14	7
15	0
16	26
17	29
18	30
19	33
20	0
21	0
22	0
23	41
24	0
25	24
26	50
27	0
28	53
29	18
30	14
31	0
32	65
33	34
34	69
35	74
36	0
37	26
38	81
39	0
40	86
41	89
42	90
43	0
44	48
45	98
46	0
47	105
48	0
49	113
50	38
51	0
52	0
53	12
54	25
55	8
56	0
57	134
58	0
59	46
60	35
61	47
62	146
63	51
64	0
65	78
66	158
67	15
68	0
69	173
70	174
71	44
72	0

n	a(n)
1	0
2	1
3	2
4	0
5	5
6	6
7	4
8	9
9	0
10	14
11	0
12	18
13	10
14	7
15	0
16	26
17	29
18	30
19	33
20	0
21	0
22	0
23	41
24	0
25	24
26	50
27	0
28	53
29	18
30	14
31	0
32	65
33	34
34	69
35	74
36	0
37	26
38	81
39	0
40	86
41	89
42	90
43	0
44	48
45	98
46	0
47	105
48	0
49	113
50	38
51	0
52	0
53	12
54	25
55	8
56	0
57	134
58	0
59	46
60	35
61	47
62	146
63	51
64	0
65	78
66	158
67	15
68	0
69	173
70	174
71	44
72	0