A180783 - cp's OEIS frontend

A180783 Number of distinct solutions of Sum_{i=1..1} (x(2i-1)*x(2i)) == 1 (mod n), with x() in {1,2,...,n-1}.

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

[0, 1, 2, 2, 3, 2, 4, 4, 4, 3, 6, 4, 7, 4, 6, 6, 9, 4, 10, 6, 8, 6, 12, 8, 11, 7, 10, 8, 15, 6, 16, 10, 12, 9, 14, 8, 19, 10, 14, 12, 21, 8, 22, 12, 14, 12, 24, 12, 22, 11, 18, 14, 27, 10, 22, 16, 20, 15, 30, 12, 31, 16, 20, 18, 26, 12, 34, 18, 24, 14, 36, 16, 37, 19, 22, 20, 32, 14, 40, 20, 28]

cp's OEIS Frontend

A180783 Number of distinct solutions of Sum_{i=1..1} (x(2i-1)*x(2i)) == 1 (mod n), with x() in {1,2,...,n-1}.

Table of values

List of values

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

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

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