A127481 - cp's OEIS frontend

A127481 Triangle T(n,k) read by rows: T(n,k) = sum_{l=k..n, l|n, k|l} l*phi(k).

n	a(n)
1	1
2	3
3	2
4	4
5	0
6	6
7	7
8	6
9	0
10	8
11	6
12	0
13	0
14	0
15	20
16	12
17	8
18	18
19	0
20	0
21	12
22	8
23	0
24	0
25	0
26	0
27	0
28	42
29	15
30	14
31	0
32	24
33	0
34	0
35	0
36	32
37	13
38	0
39	24
40	0
41	0
42	0
43	0
44	0
45	54
46	18
47	12
48	0
49	0
50	60
51	0
52	0
53	0
54	0
55	40
56	12
57	0
58	0
59	0
60	0
61	0
62	0
63	0
64	0
65	0
66	110
67	28
68	24
69	42
70	32
71	0
72	36
73	0
74	0
75	0
76	0
77	0
78	48
79	14
80	0
81	0
82	0
83	0
84	0
85	0
86	0
87	0

[1, 3, 2, 4, 0, 6, 7, 6, 0, 8, 6, 0, 0, 0, 20, 12, 8, 18, 0, 0, 12, 8, 0, 0, 0, 0, 0, 42, 15, 14, 0, 24, 0, 0, 0, 32, 13, 0, 24, 0, 0, 0, 0, 0, 54, 18, 12, 0, 0, 60, 0, 0, 0, 0, 40, 12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 110, 28, 24, 42, 32, 0, 36, 0, 0, 0, 0, 0, 48, 14, 0, 0, 0, 0, 0, 0, 0, 0]

cp's OEIS Frontend

A127481 Triangle T(n,k) read by rows: T(n,k) = sum_{l=k..n, l|n, k|l} l*phi(k).

Table of values

List of values

n	a(n)
1	1
2	3
3	2
4	4
5	0
6	6
7	7
8	6
9	0
10	8
11	6
12	0
13	0
14	0
15	20
16	12
17	8
18	18
19	0
20	0
21	12
22	8
23	0
24	0
25	0
26	0
27	0
28	42
29	15
30	14
31	0
32	24
33	0
34	0
35	0
36	32
37	13
38	0
39	24
40	0
41	0
42	0
43	0
44	0
45	54
46	18
47	12
48	0
49	0
50	60
51	0
52	0
53	0
54	0
55	40
56	12
57	0
58	0
59	0
60	0
61	0
62	0
63	0
64	0
65	0
66	110
67	28
68	24
69	42
70	32
71	0
72	36
73	0
74	0
75	0
76	0
77	0
78	48
79	14
80	0
81	0
82	0
83	0
84	0
85	0
86	0
87	0

n	a(n)
1	1
2	3
3	2
4	4
5	0
6	6
7	7
8	6
9	0
10	8
11	6
12	0
13	0
14	0
15	20
16	12
17	8
18	18
19	0
20	0
21	12
22	8
23	0
24	0
25	0
26	0
27	0
28	42
29	15
30	14
31	0
32	24
33	0
34	0
35	0
36	32
37	13
38	0
39	24
40	0
41	0
42	0
43	0
44	0
45	54
46	18
47	12
48	0
49	0
50	60
51	0
52	0
53	0
54	0
55	40
56	12
57	0
58	0
59	0
60	0
61	0
62	0
63	0
64	0
65	0
66	110
67	28
68	24
69	42
70	32
71	0
72	36
73	0
74	0
75	0
76	0
77	0
78	48
79	14
80	0
81	0
82	0
83	0
84	0
85	0
86	0
87	0

n	a(n)
1	1
2	3
3	2
4	4
5	0
6	6
7	7
8	6
9	0
10	8
11	6
12	0
13	0
14	0
15	20
16	12
17	8
18	18
19	0
20	0
21	12
22	8
23	0
24	0
25	0
26	0
27	0
28	42
29	15
30	14
31	0
32	24
33	0
34	0
35	0
36	32
37	13
38	0
39	24
40	0
41	0
42	0
43	0
44	0
45	54
46	18
47	12
48	0
49	0
50	60
51	0
52	0
53	0
54	0
55	40
56	12
57	0
58	0
59	0
60	0
61	0
62	0
63	0
64	0
65	0
66	110
67	28
68	24
69	42
70	32
71	0
72	36
73	0
74	0
75	0
76	0
77	0
78	48
79	14
80	0
81	0
82	0
83	0
84	0
85	0
86	0
87	0