A127476 - cp's OEIS frontend

A127476 Triangle T(n,k) = sum_{j=k..n, gcd(n,j)=1, k|j} phi(k).

n	a(n)
1	1
2	1
3	0
4	2
5	1
6	0
7	2
8	0
9	2
10	0
11	4
12	2
13	2
14	2
15	0
16	2
17	0
18	0
19	0
20	4
21	0
22	6
23	3
24	4
25	2
26	4
27	2
28	0
29	4
30	0
31	2
32	0
33	4
34	0
35	6
36	0
37	6
38	3
39	0
40	4
41	4
42	0
43	6
44	4
45	0
46	4
47	0
48	4
49	0
50	0
51	0
52	6
53	0
54	6
55	0
56	10
57	5
58	6
59	4
60	8
61	2
62	6
63	4
64	6
65	4
66	0
67	4
68	0
69	0
70	0
71	4
72	0
73	6
74	0
75	0
76	0
77	10
78	0

[1, 1, 0, 2, 1, 0, 2, 0, 2, 0, 4, 2, 2, 2, 0, 2, 0, 0, 0, 4, 0, 6, 3, 4, 2, 4, 2, 0, 4, 0, 2, 0, 4, 0, 6, 0, 6, 3, 0, 4, 4, 0, 6, 4, 0, 4, 0, 4, 0, 0, 0, 6, 0, 6, 0, 10, 5, 6, 4, 8, 2, 6, 4, 6, 4, 0, 4, 0, 0, 0, 4, 0, 6, 0, 0, 0, 10, 0]

cp's OEIS Frontend

A127476 Triangle T(n,k) = sum_{j=k..n, gcd(n,j)=1, k|j} phi(k).

Table of values

List of values

n	a(n)
1	1
2	1
3	0
4	2
5	1
6	0
7	2
8	0
9	2
10	0
11	4
12	2
13	2
14	2
15	0
16	2
17	0
18	0
19	0
20	4
21	0
22	6
23	3
24	4
25	2
26	4
27	2
28	0
29	4
30	0
31	2
32	0
33	4
34	0
35	6
36	0
37	6
38	3
39	0
40	4
41	4
42	0
43	6
44	4
45	0
46	4
47	0
48	4
49	0
50	0
51	0
52	6
53	0
54	6
55	0
56	10
57	5
58	6
59	4
60	8
61	2
62	6
63	4
64	6
65	4
66	0
67	4
68	0
69	0
70	0
71	4
72	0
73	6
74	0
75	0
76	0
77	10
78	0

n	a(n)
1	1
2	1
3	0
4	2
5	1
6	0
7	2
8	0
9	2
10	0
11	4
12	2
13	2
14	2
15	0
16	2
17	0
18	0
19	0
20	4
21	0
22	6
23	3
24	4
25	2
26	4
27	2
28	0
29	4
30	0
31	2
32	0
33	4
34	0
35	6
36	0
37	6
38	3
39	0
40	4
41	4
42	0
43	6
44	4
45	0
46	4
47	0
48	4
49	0
50	0
51	0
52	6
53	0
54	6
55	0
56	10
57	5
58	6
59	4
60	8
61	2
62	6
63	4
64	6
65	4
66	0
67	4
68	0
69	0
70	0
71	4
72	0
73	6
74	0
75	0
76	0
77	10
78	0

n	a(n)
1	1
2	1
3	0
4	2
5	1
6	0
7	2
8	0
9	2
10	0
11	4
12	2
13	2
14	2
15	0
16	2
17	0
18	0
19	0
20	4
21	0
22	6
23	3
24	4
25	2
26	4
27	2
28	0
29	4
30	0
31	2
32	0
33	4
34	0
35	6
36	0
37	6
38	3
39	0
40	4
41	4
42	0
43	6
44	4
45	0
46	4
47	0
48	4
49	0
50	0
51	0
52	6
53	0
54	6
55	0
56	10
57	5
58	6
59	4
60	8
61	2
62	6
63	4
64	6
65	4
66	0
67	4
68	0
69	0
70	0
71	4
72	0
73	6
74	0
75	0
76	0
77	10
78	0