A127572 - cp's OEIS frontend

A127572 Triangle, T(n,k) = sigma(k) * n/k if k|n, T(n,k) = 0 otherwise.

n	a(n)
1	1
2	2
3	3
4	3
5	0
6	4
7	4
8	6
9	0
10	7
11	5
12	0
13	0
14	0
15	6
16	6
17	9
18	8
19	0
20	0
21	12
22	7
23	0
24	0
25	0
26	0
27	0
28	8
29	8
30	12
31	0
32	14
33	0
34	0
35	0
36	15
37	9
38	0
39	12
40	0
41	0
42	0
43	0
44	0
45	13
46	10
47	15
48	0
49	0
50	12
51	0
52	0
53	0
54	0
55	18

[1, 2, 3, 3, 0, 4, 4, 6, 0, 7, 5, 0, 0, 0, 6, 6, 9, 8, 0, 0, 12, 7, 0, 0, 0, 0, 0, 8, 8, 12, 0, 14, 0, 0, 0, 15, 9, 0, 12, 0, 0, 0, 0, 0, 13, 10, 15, 0, 0, 12, 0, 0, 0, 0, 18]

cp's OEIS Frontend

A127572 Triangle, T(n,k) = sigma(k) * n/k if k|n, T(n,k) = 0 otherwise.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	3
5	0
6	4
7	4
8	6
9	0
10	7
11	5
12	0
13	0
14	0
15	6
16	6
17	9
18	8
19	0
20	0
21	12
22	7
23	0
24	0
25	0
26	0
27	0
28	8
29	8
30	12
31	0
32	14
33	0
34	0
35	0
36	15
37	9
38	0
39	12
40	0
41	0
42	0
43	0
44	0
45	13
46	10
47	15
48	0
49	0
50	12
51	0
52	0
53	0
54	0
55	18

n	a(n)
1	1
2	2
3	3
4	3
5	0
6	4
7	4
8	6
9	0
10	7
11	5
12	0
13	0
14	0
15	6
16	6
17	9
18	8
19	0
20	0
21	12
22	7
23	0
24	0
25	0
26	0
27	0
28	8
29	8
30	12
31	0
32	14
33	0
34	0
35	0
36	15
37	9
38	0
39	12
40	0
41	0
42	0
43	0
44	0
45	13
46	10
47	15
48	0
49	0
50	12
51	0
52	0
53	0
54	0
55	18

n	a(n)
1	1
2	2
3	3
4	3
5	0
6	4
7	4
8	6
9	0
10	7
11	5
12	0
13	0
14	0
15	6
16	6
17	9
18	8
19	0
20	0
21	12
22	7
23	0
24	0
25	0
26	0
27	0
28	8
29	8
30	12
31	0
32	14
33	0
34	0
35	0
36	15
37	9
38	0
39	12
40	0
41	0
42	0
43	0
44	0
45	13
46	10
47	15
48	0
49	0
50	12
51	0
52	0
53	0
54	0
55	18