A087726 - cp's OEIS frontend

A087726 Number of elements X in the matrix ring M_2(Z_n) such that X^2 == 0 mod n.

n	a(n)
1	1
2	4
3	9
4	28
5	25
6	36
7	49
8	112
9	153
10	100
11	121
12	252
13	169
14	196
15	225
16	640
17	289
18	612
19	361
20	700
21	441
22	484
23	529
24	1008
25	1225
26	676
27	1377
28	1372
29	841
30	900
31	961
32	2560
33	1089
34	1156
35	1225
36	4284
37	1369
38	1444
39	1521
40	2800
41	1681
42	1764
43	1849
44	3388
45	3825
46	2116
47	2209
48	5760
49	4753
50	4900
51	2601
52	4732

[1, 4, 9, 28, 25, 36, 49, 112, 153, 100, 121, 252, 169, 196, 225, 640, 289, 612, 361, 700, 441, 484, 529, 1008, 1225, 676, 1377, 1372, 841, 900, 961, 2560, 1089, 1156, 1225, 4284, 1369, 1444, 1521, 2800, 1681, 1764, 1849, 3388, 3825, 2116, 2209, 5760, 4753, 4900, 2601, 4732]

cp's OEIS Frontend

A087726 Number of elements X in the matrix ring M_2(Z_n) such that X^2 == 0 mod n.

Table of values

List of values