A372619 - cp's OEIS frontend

A372619 Square array T(n,k), n >= 1, k >= 1, read by antidiagonals downwards, where T(n,k) = 1/(phi(k)) * Sum_{j=1..n} phi(k*j).

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

[1, 1, 2, 1, 3, 4, 1, 2, 5, 6, 1, 3, 5, 9, 10, 1, 2, 5, 7, 13, 12, 1, 3, 4, 9, 11, 17, 18, 1, 2, 6, 6, 13, 14, 23, 22, 1, 3, 4, 10, 11, 17, 20, 31, 28, 1, 2, 5, 6, 14, 13, 23, 24, 37, 32, 1, 3, 5, 9, 10, 20, 19, 31, 33, 45, 42, 1, 2, 5, 7, 13, 12, 26, 23, 37, 37, 55, 46]

cp's OEIS Frontend

A372619 Square array T(n,k), n >= 1, k >= 1, read by antidiagonals downwards, where T(n,k) = 1/(phi(k)) * Sum_{j=1..n} phi(k*j).

Table of values

List of values

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

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

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