A264809 - cp's OEIS frontend

A264809 Irregular array read by rows: row n contains the invariant factors of every (up to isomorphism) abelian group of order n for n>=2.

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

[2, 3, 4, 2, 2, 5, 6, 7, 8, 4, 2, 2, 2, 2, 9, 3, 3, 10, 11, 12, 6, 2, 13, 14, 15, 16, 8, 2, 4, 4, 4, 2, 2, 2, 2, 2, 2, 17, 18, 6, 3, 19, 20, 10, 2, 21, 22, 23, 24, 12, 2, 6, 2, 2, 25, 5, 5, 26, 27, 9, 3, 3, 3, 3, 28, 14, 2, 29, 30]

cp's OEIS Frontend

A264809 Irregular array read by rows: row n contains the invariant factors of every (up to isomorphism) abelian group of order n for n>=2.

Table of values

List of values

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

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

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