A180784 - cp's OEIS frontend

A180784 Number of distinct solutions of sum{i=1..2}(x(2i-1)*x(2i)) = 1 (mod n), with x() only in 1..n-1.

n	a(n)
1	0
2	0
3	1
4	4
5	9
6	19
7	31
8	42
9	75
10	91
11	136
12	160
13	232
14	254
15	364
16	388
17	542
18	525
19	767
20	754
21	1015
22	993
23	1389
24	1256
25	1795
26	1641
27	2169
28	2080
29	2838
30	2344
31	3484
32	3144
33	3971
34	3676
35	4980
36	4152
37	5989
38	5135
39	6564
40	6008
41	8195
42	6392
43	9476
44	8064
45	9912
46	9114
47	12426
48	9808
49	14032

[0, 0, 1, 4, 9, 19, 31, 42, 75, 91, 136, 160, 232, 254, 364, 388, 542, 525, 767, 754, 1015, 993, 1389, 1256, 1795, 1641, 2169, 2080, 2838, 2344, 3484, 3144, 3971, 3676, 4980, 4152, 5989, 5135, 6564, 6008, 8195, 6392, 9476, 8064, 9912, 9114, 12426, 9808, 14032]

cp's OEIS Frontend

A180784 Number of distinct solutions of sum{i=1..2}(x(2i-1)*x(2i)) = 1 (mod n), with x() only in 1..n-1.

Table of values

List of values