A127571 - cp's OEIS frontend

A127571 Triangle T(n,k) = phi(n/k)*sigma(k) if k divides n, else 0.

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

[1, 1, 3, 2, 0, 4, 2, 3, 0, 7, 4, 0, 0, 0, 6, 2, 6, 4, 0, 0, 12, 6, 0, 0, 0, 0, 0, 8, 4, 6, 0, 7, 0, 0, 0, 15, 6, 0, 8, 0, 0, 0, 0, 0, 13, 4, 12, 0, 0, 6, 0, 0, 0, 0, 18]

cp's OEIS Frontend

A127571 Triangle T(n,k) = phi(n/k)*sigma(k) if k divides n, else 0.

Table of values

List of values

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

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

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