A216626 - cp's OEIS frontend

A216626 Square array read by antidiagonals, T(n,k) = sum_{c|n,d|k} lcm(c,d) for n>=1, k>=1.

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

[1, 3, 3, 4, 7, 4, 7, 12, 12, 7, 6, 15, 10, 15, 6, 12, 18, 28, 28, 18, 12, 8, 28, 24, 27, 24, 28, 8, 15, 24, 30, 42, 42, 30, 24, 15, 13, 31, 32, 60, 16, 60, 32, 31, 13, 18, 39, 60, 56, 72, 72, 56, 60, 39, 18, 12, 42, 28, 51, 48, 70, 48, 51, 28, 42, 12, 28, 36]

cp's OEIS Frontend

A216626 Square array read by antidiagonals, T(n,k) = sum_{c|n,d|k} lcm(c,d) for n>=1, k>=1.

Table of values

List of values

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

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

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