A207375 - cp's OEIS frontend

A207375 Irregular array read by rows in which row n lists the (one or two) central divisors of n in increasing order.

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

[1, 1, 2, 1, 3, 2, 1, 5, 2, 3, 1, 7, 2, 4, 3, 2, 5, 1, 11, 3, 4, 1, 13, 2, 7, 3, 5, 4, 1, 17, 3, 6, 1, 19, 4, 5, 3, 7, 2, 11, 1, 23, 4, 6, 5, 2, 13, 3, 9, 4, 7, 1, 29, 5, 6, 1, 31, 4, 8, 3, 11, 2, 17, 5, 7, 6, 1, 37, 2, 19, 3, 13, 5, 8, 1, 41, 6, 7, 1, 43]

cp's OEIS Frontend

A207375 Irregular array read by rows in which row n lists the (one or two) central divisors of n in increasing order.

Table of values

List of values

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

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

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