A216627 - cp's OEIS frontend

A216627 Triangle read by rows, n>=1, 1<=k<=n, T(n,k) = sum_{c|n,d|k} lcm(c,d).

n	a(n)
1	1
2	3
3	7
4	4
5	12
6	10
7	7
8	15
9	28
10	27
11	6
12	18
13	24
14	42
15	16
16	12
17	28
18	30
19	60
20	72
21	70
22	8
23	24
24	32
25	56
26	48
27	96
28	22
29	15
30	31
31	60
32	51
33	90
34	124
35	120
36	83
37	13
38	39
39	28
40	91
41	78
42	84
43	104
44	195
45	55
46	18
47	42
48	72
49	90
50	48
51	168
52	144
53	186
54	234
55	112
56	12
57	36
58	48
59	84
60	72
61	144
62	96
63	180
64	156

[1, 3, 7, 4, 12, 10, 7, 15, 28, 27, 6, 18, 24, 42, 16, 12, 28, 30, 60, 72, 70, 8, 24, 32, 56, 48, 96, 22, 15, 31, 60, 51, 90, 124, 120, 83, 13, 39, 28, 91, 78, 84, 104, 195, 55, 18, 42, 72, 90, 48, 168, 144, 186, 234, 112, 12, 36, 48, 84, 72, 144, 96, 180, 156]

cp's OEIS Frontend

A216627 Triangle read by rows, n>=1, 1<=k<=n, T(n,k) = sum_{c|n,d|k} lcm(c,d).

Table of values

List of values

n	a(n)
1	1
2	3
3	7
4	4
5	12
6	10
7	7
8	15
9	28
10	27
11	6
12	18
13	24
14	42
15	16
16	12
17	28
18	30
19	60
20	72
21	70
22	8
23	24
24	32
25	56
26	48
27	96
28	22
29	15
30	31
31	60
32	51
33	90
34	124
35	120
36	83
37	13
38	39
39	28
40	91
41	78
42	84
43	104
44	195
45	55
46	18
47	42
48	72
49	90
50	48
51	168
52	144
53	186
54	234
55	112
56	12
57	36
58	48
59	84
60	72
61	144
62	96
63	180
64	156

n	a(n)
1	1
2	3
3	7
4	4
5	12
6	10
7	7
8	15
9	28
10	27
11	6
12	18
13	24
14	42
15	16
16	12
17	28
18	30
19	60
20	72
21	70
22	8
23	24
24	32
25	56
26	48
27	96
28	22
29	15
30	31
31	60
32	51
33	90
34	124
35	120
36	83
37	13
38	39
39	28
40	91
41	78
42	84
43	104
44	195
45	55
46	18
47	42
48	72
49	90
50	48
51	168
52	144
53	186
54	234
55	112
56	12
57	36
58	48
59	84
60	72
61	144
62	96
63	180
64	156

n	a(n)
1	1
2	3
3	7
4	4
5	12
6	10
7	7
8	15
9	28
10	27
11	6
12	18
13	24
14	42
15	16
16	12
17	28
18	30
19	60
20	72
21	70
22	8
23	24
24	32
25	56
26	48
27	96
28	22
29	15
30	31
31	60
32	51
33	90
34	124
35	120
36	83
37	13
38	39
39	28
40	91
41	78
42	84
43	104
44	195
45	55
46	18
47	42
48	72
49	90
50	48
51	168
52	144
53	186
54	234
55	112
56	12
57	36
58	48
59	84
60	72
61	144
62	96
63	180
64	156