A051537 - cp's OEIS frontend

A051537 Triangle read by rows: T(i,j) = lcm(i,j)/gcd(i,j) for 1 <= j <= i.

n	a(n)
1	1
2	2
3	1
4	3
5	6
6	1
7	4
8	2
9	12
10	1
11	5
12	10
13	15
14	20
15	1
16	6
17	3
18	2
19	6
20	30
21	1
22	7
23	14
24	21
25	28
26	35
27	42
28	1
29	8
30	4
31	24
32	2
33	40
34	12
35	56
36	1
37	9
38	18
39	3
40	36
41	45
42	6
43	63
44	72
45	1
46	10
47	5
48	30
49	10
50	2
51	15
52	70
53	20
54	90
55	1
56	11
57	22
58	33
59	44
60	55
61	66
62	77
63	88
64	99
65	110
66	1
67	12
68	6
69	4
70	3
71	60
72	2
73	84
74	6
75	12
76	30
77	132
78	1
79	13
80	26
81	39

[1, 2, 1, 3, 6, 1, 4, 2, 12, 1, 5, 10, 15, 20, 1, 6, 3, 2, 6, 30, 1, 7, 14, 21, 28, 35, 42, 1, 8, 4, 24, 2, 40, 12, 56, 1, 9, 18, 3, 36, 45, 6, 63, 72, 1, 10, 5, 30, 10, 2, 15, 70, 20, 90, 1, 11, 22, 33, 44, 55, 66, 77, 88, 99, 110, 1, 12, 6, 4, 3, 60, 2, 84, 6, 12, 30, 132, 1, 13, 26, 39]

cp's OEIS Frontend

A051537 Triangle read by rows: T(i,j) = lcm(i,j)/gcd(i,j) for 1 <= j <= i.

Table of values

List of values

n	a(n)
1	1
2	2
3	1
4	3
5	6
6	1
7	4
8	2
9	12
10	1
11	5
12	10
13	15
14	20
15	1
16	6
17	3
18	2
19	6
20	30
21	1
22	7
23	14
24	21
25	28
26	35
27	42
28	1
29	8
30	4
31	24
32	2
33	40
34	12
35	56
36	1
37	9
38	18
39	3
40	36
41	45
42	6
43	63
44	72
45	1
46	10
47	5
48	30
49	10
50	2
51	15
52	70
53	20
54	90
55	1
56	11
57	22
58	33
59	44
60	55
61	66
62	77
63	88
64	99
65	110
66	1
67	12
68	6
69	4
70	3
71	60
72	2
73	84
74	6
75	12
76	30
77	132
78	1
79	13
80	26
81	39

n	a(n)
1	1
2	2
3	1
4	3
5	6
6	1
7	4
8	2
9	12
10	1
11	5
12	10
13	15
14	20
15	1
16	6
17	3
18	2
19	6
20	30
21	1
22	7
23	14
24	21
25	28
26	35
27	42
28	1
29	8
30	4
31	24
32	2
33	40
34	12
35	56
36	1
37	9
38	18
39	3
40	36
41	45
42	6
43	63
44	72
45	1
46	10
47	5
48	30
49	10
50	2
51	15
52	70
53	20
54	90
55	1
56	11
57	22
58	33
59	44
60	55
61	66
62	77
63	88
64	99
65	110
66	1
67	12
68	6
69	4
70	3
71	60
72	2
73	84
74	6
75	12
76	30
77	132
78	1
79	13
80	26
81	39

n	a(n)
1	1
2	2
3	1
4	3
5	6
6	1
7	4
8	2
9	12
10	1
11	5
12	10
13	15
14	20
15	1
16	6
17	3
18	2
19	6
20	30
21	1
22	7
23	14
24	21
25	28
26	35
27	42
28	1
29	8
30	4
31	24
32	2
33	40
34	12
35	56
36	1
37	9
38	18
39	3
40	36
41	45
42	6
43	63
44	72
45	1
46	10
47	5
48	30
49	10
50	2
51	15
52	70
53	20
54	90
55	1
56	11
57	22
58	33
59	44
60	55
61	66
62	77
63	88
64	99
65	110
66	1
67	12
68	6
69	4
70	3
71	60
72	2
73	84
74	6
75	12
76	30
77	132
78	1
79	13
80	26
81	39