A380672 - cp's OEIS frontend

A380672 Triangle read by rows where row n lists divisors d | n such that rad(d) != rad(n), where rad = A007947.

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

[1, 1, 1, 1, 1, 2, 3, 1, 1, 1, 1, 2, 5, 1, 1, 2, 3, 4, 1, 1, 2, 7, 1, 3, 5, 1, 1, 1, 2, 3, 9, 1, 1, 2, 4, 5, 1, 3, 7, 1, 2, 11, 1, 1, 2, 3, 4, 8, 1, 1, 2, 13, 1, 1, 2, 4, 7, 1, 1, 2, 3, 5, 6, 10, 15, 1, 1, 1, 3, 11, 1, 2, 17, 1, 5, 7, 1, 2, 3, 4, 9, 1, 1, 2, 19]

cp's OEIS Frontend

A380672 Triangle read by rows where row n lists divisors d | n such that rad(d) != rad(n), where rad = A007947.

Table of values

List of values

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

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

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