A209411 - cp's OEIS frontend

A209411 Number of 2 x 2 matrices M such that M*transpose(M) == 0 mod n.

n	a(n)
1	1
2	4
3	1
4	16
5	49
6	4
7	1
8	64
9	81
10	196
11	1
12	16
13	337
14	4
15	49
16	256
17	577
18	324
19	1
20	784
21	1
22	4
23	1
24	64
25	1825
26	1348
27	81
28	16
29	1681
30	196
31	1
32	1024
33	1
34	2308
35	49
36	1296
37	2737
38	4
39	337
40	3136
41	3361
42	4
43	1
44	16
45	3969
46	4
47	1
48	256
49	2401
50	7300
51	577
52	5392
53	5617
54	324
55	49
56	64
57	1

[1, 4, 1, 16, 49, 4, 1, 64, 81, 196, 1, 16, 337, 4, 49, 256, 577, 324, 1, 784, 1, 4, 1, 64, 1825, 1348, 81, 16, 1681, 196, 1, 1024, 1, 2308, 49, 1296, 2737, 4, 337, 3136, 3361, 4, 1, 16, 3969, 4, 1, 256, 2401, 7300, 577, 5392, 5617, 324, 49, 64, 1]

cp's OEIS Frontend

A209411 Number of 2 x 2 matrices M such that M*transpose(M) == 0 mod n.

Table of values

List of values