A290478 - cp's OEIS frontend

A290478 Triangle read by rows in which row n lists the sum of the divisors of each divisor of n.

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

[1, 1, 3, 1, 4, 1, 3, 7, 1, 6, 1, 3, 4, 12, 1, 8, 1, 3, 7, 15, 1, 4, 13, 1, 3, 6, 18, 1, 12, 1, 3, 4, 7, 12, 28, 1, 14, 1, 3, 8, 24, 1, 4, 6, 24, 1, 3, 7, 15, 31, 1, 18, 1, 3, 4, 12, 13, 39, 1, 20, 1, 3, 7, 6, 18, 42, 1, 4, 8, 32, 1, 3, 12, 36, 1, 24, 1, 3, 4, 7]

cp's OEIS Frontend

A290478 Triangle read by rows in which row n lists the sum of the divisors of each divisor of n.

Table of values

List of values

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

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

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