A222310 - cp's OEIS frontend

A222310 Array read by antidiagonals: first row is 1, 2, 3, 4, ...; for subsequent rows, write i*j/gcd(i,j)^2 under ...i.j... in previous row.

n	a(n)
1	1
2	2
3	2
4	3
5	6
6	3
7	6
8	2
9	12
10	4
11	5
12	30
13	15
14	20
15	5
16	15
17	3
18	10
19	6
20	30
21	6
22	105
23	7
24	21
25	210
26	35
27	42
28	7
29	70
30	6
31	42
32	2
33	420
34	12
35	56
36	8
37	1
38	70
39	105
40	10
41	5
42	84
43	63
44	72
45	9
46	5
47	5
48	14
49	30
50	3
51	15
52	1260
53	20
54	90
55	10
56	33
57	165
58	33
59	462
60	385
61	1155
62	77
63	1980
64	99
65	110
66	11
67	55
68	15
69	11
70	3
71	154
72	10
73	462
74	6
75	330
76	30
77	132
78	12
79	65
80	143
81	2145
82	195
83	65
84	10010
85	1001
86	78

[1, 2, 2, 3, 6, 3, 6, 2, 12, 4, 5, 30, 15, 20, 5, 15, 3, 10, 6, 30, 6, 105, 7, 21, 210, 35, 42, 7, 70, 6, 42, 2, 420, 12, 56, 8, 1, 70, 105, 10, 5, 84, 63, 72, 9, 5, 5, 14, 30, 3, 15, 1260, 20, 90, 10, 33, 165, 33, 462, 385, 1155, 77, 1980, 99, 110, 11, 55, 15, 11, 3, 154, 10, 462, 6, 330, 30, 132, 12, 65, 143, 2145, 195, 65, 10010, 1001, 78]

cp's OEIS Frontend

A222310 Array read by antidiagonals: first row is 1, 2, 3, 4, ...; for subsequent rows, write i*j/gcd(i,j)^2 under ...i.j... in previous row.

Table of values

List of values