A210959 - cp's OEIS frontend

A210959 Triangle read by rows in which row n lists the divisors of n starting with 1, n, the second smallest divisor of n, the second largest divisor of n, the third smallest divisor of n, the third largest divisor of n, and so on.

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

[1, 1, 2, 1, 3, 1, 4, 2, 1, 5, 1, 6, 2, 3, 1, 7, 1, 8, 2, 4, 1, 9, 3, 1, 10, 2, 5, 1, 11, 1, 12, 2, 6, 3, 4, 1, 13, 1, 14, 2, 7, 1, 15, 3, 5, 1, 16, 2, 8, 4, 1, 17, 1, 18, 2, 9, 3, 6, 1, 19, 1, 20, 2, 10, 4, 5, 1, 21, 3, 7, 1, 22, 2, 11, 1, 23, 1, 24]

cp's OEIS Frontend

A210959 Triangle read by rows in which row n lists the divisors of n starting with 1, n, the second smallest divisor of n, the second largest divisor of n, the third smallest divisor of n, the third largest divisor of n, and so on.

Table of values

List of values

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

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

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