A163870 - cp's OEIS frontend

A163870 Triangle read by rows: row n lists the nontrivial divisors of the n-th composite.

n	a(n)
1	2
2	2
3	3
4	2
5	4
6	3
7	2
8	5
9	2
10	3
11	4
12	6
13	2
14	7
15	3
16	5
17	2
18	4
19	8
20	2
21	3
22	6
23	9
24	2
25	4
26	5
27	10
28	3
29	7
30	2
31	11
32	2
33	3
34	4
35	6
36	8
37	12
38	5
39	2
40	13
41	3
42	9
43	2
44	4
45	7
46	14
47	2
48	3
49	5
50	6
51	10
52	15
53	2
54	4
55	8
56	16
57	3
58	11
59	2
60	17
61	5
62	7
63	2
64	3
65	4
66	6
67	9
68	12
69	18
70	2
71	19
72	3
73	13
74	2
75	4
76	5
77	8
78	10
79	20
80	2
81	3
82	6
83	7
84	14
85	21
86	2
87	4
88	11
89	22
90	3
91	5
92	9
93	15
94	2
95	23

[2, 2, 3, 2, 4, 3, 2, 5, 2, 3, 4, 6, 2, 7, 3, 5, 2, 4, 8, 2, 3, 6, 9, 2, 4, 5, 10, 3, 7, 2, 11, 2, 3, 4, 6, 8, 12, 5, 2, 13, 3, 9, 2, 4, 7, 14, 2, 3, 5, 6, 10, 15, 2, 4, 8, 16, 3, 11, 2, 17, 5, 7, 2, 3, 4, 6, 9, 12, 18, 2, 19, 3, 13, 2, 4, 5, 8, 10, 20, 2, 3, 6, 7, 14, 21, 2, 4, 11, 22, 3, 5, 9, 15, 2, 23]

cp's OEIS Frontend

A163870 Triangle read by rows: row n lists the nontrivial divisors of the n-th composite.

Table of values

List of values

n	a(n)
1	2
2	2
3	3
4	2
5	4
6	3
7	2
8	5
9	2
10	3
11	4
12	6
13	2
14	7
15	3
16	5
17	2
18	4
19	8
20	2
21	3
22	6
23	9
24	2
25	4
26	5
27	10
28	3
29	7
30	2
31	11
32	2
33	3
34	4
35	6
36	8
37	12
38	5
39	2
40	13
41	3
42	9
43	2
44	4
45	7
46	14
47	2
48	3
49	5
50	6
51	10
52	15
53	2
54	4
55	8
56	16
57	3
58	11
59	2
60	17
61	5
62	7
63	2
64	3
65	4
66	6
67	9
68	12
69	18
70	2
71	19
72	3
73	13
74	2
75	4
76	5
77	8
78	10
79	20
80	2
81	3
82	6
83	7
84	14
85	21
86	2
87	4
88	11
89	22
90	3
91	5
92	9
93	15
94	2
95	23

n	a(n)
1	2
2	2
3	3
4	2
5	4
6	3
7	2
8	5
9	2
10	3
11	4
12	6
13	2
14	7
15	3
16	5
17	2
18	4
19	8
20	2
21	3
22	6
23	9
24	2
25	4
26	5
27	10
28	3
29	7
30	2
31	11
32	2
33	3
34	4
35	6
36	8
37	12
38	5
39	2
40	13
41	3
42	9
43	2
44	4
45	7
46	14
47	2
48	3
49	5
50	6
51	10
52	15
53	2
54	4
55	8
56	16
57	3
58	11
59	2
60	17
61	5
62	7
63	2
64	3
65	4
66	6
67	9
68	12
69	18
70	2
71	19
72	3
73	13
74	2
75	4
76	5
77	8
78	10
79	20
80	2
81	3
82	6
83	7
84	14
85	21
86	2
87	4
88	11
89	22
90	3
91	5
92	9
93	15
94	2
95	23

n	a(n)
1	2
2	2
3	3
4	2
5	4
6	3
7	2
8	5
9	2
10	3
11	4
12	6
13	2
14	7
15	3
16	5
17	2
18	4
19	8
20	2
21	3
22	6
23	9
24	2
25	4
26	5
27	10
28	3
29	7
30	2
31	11
32	2
33	3
34	4
35	6
36	8
37	12
38	5
39	2
40	13
41	3
42	9
43	2
44	4
45	7
46	14
47	2
48	3
49	5
50	6
51	10
52	15
53	2
54	4
55	8
56	16
57	3
58	11
59	2
60	17
61	5
62	7
63	2
64	3
65	4
66	6
67	9
68	12
69	18
70	2
71	19
72	3
73	13
74	2
75	4
76	5
77	8
78	10
79	20
80	2
81	3
82	6
83	7
84	14
85	21
86	2
87	4
88	11
89	22
90	3
91	5
92	9
93	15
94	2
95	23