A179229 - cp's OEIS frontend

A179229 a(n) = number of Abelian groups of order 2*n which are not isomorphic to the group of units of the ring Z/kZ for any k.

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	0
7	1
8	2
9	1
10	0
11	0
12	1
13	1
14	1
15	0
16	3
17	1
18	1
19	1
20	0
21	0
22	1
23	0
24	2
25	2
26	1
27	2
28	2
29	0
30	0
31	1
32	6
33	0
34	2
35	0
36	1
37	1
38	2
39	0
40	2
41	0
42	1
43	1
44	0
45	2
46	1
47	1
48	2
49	2
50	3
51	0
52	2
53	0
54	3
55	0
56	2
57	1
58	1
59	1
60	1
61	1
62	2
63	1
64	10
65	0
66	1
67	1
68	2
69	0
70	1
71	1
72	4
73	1
74	1
75	1
76	3
77	1
78	0
79	1
80	2
81	4
82	1
83	0
84	1
85	1
86	1

[0, 0, 0, 1, 0, 0, 1, 2, 1, 0, 0, 1, 1, 1, 0, 3, 1, 1, 1, 0, 0, 1, 0, 2, 2, 1, 2, 2, 0, 0, 1, 6, 0, 2, 0, 1, 1, 2, 0, 2, 0, 1, 1, 0, 2, 1, 1, 2, 2, 3, 0, 2, 0, 3, 0, 2, 1, 1, 1, 1, 1, 2, 1, 10, 0, 1, 1, 2, 0, 1, 1, 4, 1, 1, 1, 3, 1, 0, 1, 2, 4, 1, 0, 1, 1, 1]

cp's OEIS Frontend

A179229 a(n) = number of Abelian groups of order 2*n which are not isomorphic to the group of units of the ring Z/kZ for any k.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	0
7	1
8	2
9	1
10	0
11	0
12	1
13	1
14	1
15	0
16	3
17	1
18	1
19	1
20	0
21	0
22	1
23	0
24	2
25	2
26	1
27	2
28	2
29	0
30	0
31	1
32	6
33	0
34	2
35	0
36	1
37	1
38	2
39	0
40	2
41	0
42	1
43	1
44	0
45	2
46	1
47	1
48	2
49	2
50	3
51	0
52	2
53	0
54	3
55	0
56	2
57	1
58	1
59	1
60	1
61	1
62	2
63	1
64	10
65	0
66	1
67	1
68	2
69	0
70	1
71	1
72	4
73	1
74	1
75	1
76	3
77	1
78	0
79	1
80	2
81	4
82	1
83	0
84	1
85	1
86	1

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	0
7	1
8	2
9	1
10	0
11	0
12	1
13	1
14	1
15	0
16	3
17	1
18	1
19	1
20	0
21	0
22	1
23	0
24	2
25	2
26	1
27	2
28	2
29	0
30	0
31	1
32	6
33	0
34	2
35	0
36	1
37	1
38	2
39	0
40	2
41	0
42	1
43	1
44	0
45	2
46	1
47	1
48	2
49	2
50	3
51	0
52	2
53	0
54	3
55	0
56	2
57	1
58	1
59	1
60	1
61	1
62	2
63	1
64	10
65	0
66	1
67	1
68	2
69	0
70	1
71	1
72	4
73	1
74	1
75	1
76	3
77	1
78	0
79	1
80	2
81	4
82	1
83	0
84	1
85	1
86	1

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	0
7	1
8	2
9	1
10	0
11	0
12	1
13	1
14	1
15	0
16	3
17	1
18	1
19	1
20	0
21	0
22	1
23	0
24	2
25	2
26	1
27	2
28	2
29	0
30	0
31	1
32	6
33	0
34	2
35	0
36	1
37	1
38	2
39	0
40	2
41	0
42	1
43	1
44	0
45	2
46	1
47	1
48	2
49	2
50	3
51	0
52	2
53	0
54	3
55	0
56	2
57	1
58	1
59	1
60	1
61	1
62	2
63	1
64	10
65	0
66	1
67	1
68	2
69	0
70	1
71	1
72	4
73	1
74	1
75	1
76	3
77	1
78	0
79	1
80	2
81	4
82	1
83	0
84	1
85	1
86	1