A161901 - cp's OEIS frontend

A161901 Array read by rows in which row n lists the divisors of n, but if n is a square then the square root of n appears twice.

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

[1, 1, 1, 2, 1, 3, 1, 2, 2, 4, 1, 5, 1, 2, 3, 6, 1, 7, 1, 2, 4, 8, 1, 3, 3, 9, 1, 2, 5, 10, 1, 11, 1, 2, 3, 4, 6, 12, 1, 13, 1, 2, 7, 14, 1, 3, 5, 15, 1, 2, 4, 4, 8, 16, 1, 17, 1, 2, 3, 6, 9, 18, 1, 19, 1, 2, 4, 5, 10, 20, 1, 3, 7, 21]

cp's OEIS Frontend

A161901 Array read by rows in which row n lists the divisors of n, but if n is a square then the square root of n appears twice.

Table of values

List of values

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

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

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