A380819 - cp's OEIS frontend

A380819 Triangle read by rows where row n lists "weak" divisors d | n (i.e., d in A052485) such that rad(d)^2 does not divide d, where rad = A007947.

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

[2, 3, 2, 5, 2, 3, 6, 7, 2, 3, 2, 5, 10, 11, 2, 3, 6, 12, 13, 2, 7, 14, 3, 5, 15, 2, 17, 2, 3, 6, 18, 19, 2, 5, 10, 20, 3, 7, 21, 2, 11, 22, 23, 2, 3, 6, 12, 24, 5, 2, 13, 26, 3, 2, 7, 14, 28, 29, 2, 3, 5, 6, 10, 15, 30, 31, 2, 3, 11, 33, 2, 17, 34, 5, 7, 35, 2, 3, 6, 12, 18]

cp's OEIS Frontend

A380819 Triangle read by rows where row n lists "weak" divisors d | n (i.e., d in A052485) such that rad(d)^2 does not divide d, where rad = A007947.

Table of values

List of values

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

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

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