A003561 - cp's OEIS frontend

A003561 Least number m such that 5^m == +- 1 (mod 5n + 1).

n	a(n)
1	1
2	5
3	4
4	3
5	2
6	3
7	6
8	10
9	11
10	16
11	6
12	15
13	10
14	5
15	9
16	27
17	21
18	12
19	8
20	25
21	26
22	36
23	14
24	55
25	3
26	65
27	16
28	23
29	36
30	75
31	4
32	33
33	41
34	18
35	20
36	15
37	6
38	19
39	42
40	11
41	51
42	35
43	18
44	16
45	56
46	30
47	29
48	20
49	20
50	25
51	64
52	21
53	18
54	27
55	22
56	70
57	20
58	96
59	36
60	21
61	48
62	155
63	39
64	53
65	27
66	165
67	12
68	15

[1, 5, 4, 3, 2, 3, 6, 10, 11, 16, 6, 15, 10, 5, 9, 27, 21, 12, 8, 25, 26, 36, 14, 55, 3, 65, 16, 23, 36, 75, 4, 33, 41, 18, 20, 15, 6, 19, 42, 11, 51, 35, 18, 16, 56, 30, 29, 20, 20, 25, 64, 21, 18, 27, 22, 70, 20, 96, 36, 21, 48, 155, 39, 53, 27, 165, 12, 15]

cp's OEIS Frontend

A003561 Least number m such that 5^m == +- 1 (mod 5n + 1).

Table of values

List of values

n	a(n)
1	1
2	5
3	4
4	3
5	2
6	3
7	6
8	10
9	11
10	16
11	6
12	15
13	10
14	5
15	9
16	27
17	21
18	12
19	8
20	25
21	26
22	36
23	14
24	55
25	3
26	65
27	16
28	23
29	36
30	75
31	4
32	33
33	41
34	18
35	20
36	15
37	6
38	19
39	42
40	11
41	51
42	35
43	18
44	16
45	56
46	30
47	29
48	20
49	20
50	25
51	64
52	21
53	18
54	27
55	22
56	70
57	20
58	96
59	36
60	21
61	48
62	155
63	39
64	53
65	27
66	165
67	12
68	15

n	a(n)
1	1
2	5
3	4
4	3
5	2
6	3
7	6
8	10
9	11
10	16
11	6
12	15
13	10
14	5
15	9
16	27
17	21
18	12
19	8
20	25
21	26
22	36
23	14
24	55
25	3
26	65
27	16
28	23
29	36
30	75
31	4
32	33
33	41
34	18
35	20
36	15
37	6
38	19
39	42
40	11
41	51
42	35
43	18
44	16
45	56
46	30
47	29
48	20
49	20
50	25
51	64
52	21
53	18
54	27
55	22
56	70
57	20
58	96
59	36
60	21
61	48
62	155
63	39
64	53
65	27
66	165
67	12
68	15

n	a(n)
1	1
2	5
3	4
4	3
5	2
6	3
7	6
8	10
9	11
10	16
11	6
12	15
13	10
14	5
15	9
16	27
17	21
18	12
19	8
20	25
21	26
22	36
23	14
24	55
25	3
26	65
27	16
28	23
29	36
30	75
31	4
32	33
33	41
34	18
35	20
36	15
37	6
38	19
39	42
40	11
41	51
42	35
43	18
44	16
45	56
46	30
47	29
48	20
49	20
50	25
51	64
52	21
53	18
54	27
55	22
56	70
57	20
58	96
59	36
60	21
61	48
62	155
63	39
64	53
65	27
66	165
67	12
68	15