A127505 - cp's OEIS frontend

A127505 Triangle T(n,k) = mobius(n/k)*phi(k) if k|n, otherwise T(n,k)=0; 1<=k<=n.

n	a(n)
1	1
2	-1
3	1
4	-1
5	0
6	2
7	0
8	-1
9	0
10	2
11	-1
12	0
13	0
14	0
15	4
16	1
17	-1
18	-2
19	0
20	0
21	2
22	-1
23	0
24	0
25	0
26	0
27	0
28	6
29	0
30	0
31	0
32	-2
33	0
34	0
35	0
36	4
37	0
38	0
39	-2
40	0
41	0
42	0
43	0
44	0
45	6
46	1
47	-1
48	0
49	0
50	-4
51	0
52	0
53	0
54	0
55	4
56	-1
57	0
58	0
59	0
60	0
61	0
62	0
63	0
64	0
65	0
66	10
67	0
68	1
69	0
70	-2
71	0
72	-2
73	0
74	0

[1, -1, 1, -1, 0, 2, 0, -1, 0, 2, -1, 0, 0, 0, 4, 1, -1, -2, 0, 0, 2, -1, 0, 0, 0, 0, 0, 6, 0, 0, 0, -2, 0, 0, 0, 4, 0, 0, -2, 0, 0, 0, 0, 0, 6, 1, -1, 0, 0, -4, 0, 0, 0, 0, 4, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10, 0, 1, 0, -2, 0, -2, 0, 0]

cp's OEIS Frontend

A127505 Triangle T(n,k) = mobius(n/k)*phi(k) if k|n, otherwise T(n,k)=0; 1<=k<=n.

Table of values

List of values

n	a(n)
1	1
2	-1
3	1
4	-1
5	0
6	2
7	0
8	-1
9	0
10	2
11	-1
12	0
13	0
14	0
15	4
16	1
17	-1
18	-2
19	0
20	0
21	2
22	-1
23	0
24	0
25	0
26	0
27	0
28	6
29	0
30	0
31	0
32	-2
33	0
34	0
35	0
36	4
37	0
38	0
39	-2
40	0
41	0
42	0
43	0
44	0
45	6
46	1
47	-1
48	0
49	0
50	-4
51	0
52	0
53	0
54	0
55	4
56	-1
57	0
58	0
59	0
60	0
61	0
62	0
63	0
64	0
65	0
66	10
67	0
68	1
69	0
70	-2
71	0
72	-2
73	0
74	0

n	a(n)
1	1
2	-1
3	1
4	-1
5	0
6	2
7	0
8	-1
9	0
10	2
11	-1
12	0
13	0
14	0
15	4
16	1
17	-1
18	-2
19	0
20	0
21	2
22	-1
23	0
24	0
25	0
26	0
27	0
28	6
29	0
30	0
31	0
32	-2
33	0
34	0
35	0
36	4
37	0
38	0
39	-2
40	0
41	0
42	0
43	0
44	0
45	6
46	1
47	-1
48	0
49	0
50	-4
51	0
52	0
53	0
54	0
55	4
56	-1
57	0
58	0
59	0
60	0
61	0
62	0
63	0
64	0
65	0
66	10
67	0
68	1
69	0
70	-2
71	0
72	-2
73	0
74	0

n	a(n)
1	1
2	-1
3	1
4	-1
5	0
6	2
7	0
8	-1
9	0
10	2
11	-1
12	0
13	0
14	0
15	4
16	1
17	-1
18	-2
19	0
20	0
21	2
22	-1
23	0
24	0
25	0
26	0
27	0
28	6
29	0
30	0
31	0
32	-2
33	0
34	0
35	0
36	4
37	0
38	0
39	-2
40	0
41	0
42	0
43	0
44	0
45	6
46	1
47	-1
48	0
49	0
50	-4
51	0
52	0
53	0
54	0
55	4
56	-1
57	0
58	0
59	0
60	0
61	0
62	0
63	0
64	0
65	0
66	10
67	0
68	1
69	0
70	-2
71	0
72	-2
73	0
74	0