A330868 - cp's OEIS frontend

A330868 Number of proper divisors d of n such that n-d is squarefree.

n	a(n)
1	0
2	1
3	1
4	2
5	0
6	2
7	1
8	2
9	1
10	1
11	1
12	3
13	0
14	2
15	2
16	2
17	0
18	2
19	0
20	3
21	1
22	2
23	1
24	3
25	0
26	1
27	1
28	3
29	0
30	2
31	1
32	2
33	2
34	2
35	2
36	4
37	0
38	2
39	2
40	4
41	0
42	4
43	1
44	4
45	2
46	1
47	1
48	3
49	1
50	0
51	1
52	3
53	0
54	2
55	0
56	2
57	1
58	2
59	1
60	5
61	0
62	2
63	2
64	1
65	0
66	3
67	1
68	4
69	2
70	3
71	1
72	4
73	0
74	2
75	2
76	3
77	2
78	3
79	1
80	3
81	1
82	1
83	1
84	6
85	0
86	2
87	2
88	4
89	0
90	3

[0, 1, 1, 2, 0, 2, 1, 2, 1, 1, 1, 3, 0, 2, 2, 2, 0, 2, 0, 3, 1, 2, 1, 3, 0, 1, 1, 3, 0, 2, 1, 2, 2, 2, 2, 4, 0, 2, 2, 4, 0, 4, 1, 4, 2, 1, 1, 3, 1, 0, 1, 3, 0, 2, 0, 2, 1, 2, 1, 5, 0, 2, 2, 1, 0, 3, 1, 4, 2, 3, 1, 4, 0, 2, 2, 3, 2, 3, 1, 3, 1, 1, 1, 6, 0, 2, 2, 4, 0, 3]

cp's OEIS Frontend

A330868 Number of proper divisors d of n such that n-d is squarefree.

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	2
5	0
6	2
7	1
8	2
9	1
10	1
11	1
12	3
13	0
14	2
15	2
16	2
17	0
18	2
19	0
20	3
21	1
22	2
23	1
24	3
25	0
26	1
27	1
28	3
29	0
30	2
31	1
32	2
33	2
34	2
35	2
36	4
37	0
38	2
39	2
40	4
41	0
42	4
43	1
44	4
45	2
46	1
47	1
48	3
49	1
50	0
51	1
52	3
53	0
54	2
55	0
56	2
57	1
58	2
59	1
60	5
61	0
62	2
63	2
64	1
65	0
66	3
67	1
68	4
69	2
70	3
71	1
72	4
73	0
74	2
75	2
76	3
77	2
78	3
79	1
80	3
81	1
82	1
83	1
84	6
85	0
86	2
87	2
88	4
89	0
90	3

n	a(n)
1	0
2	1
3	1
4	2
5	0
6	2
7	1
8	2
9	1
10	1
11	1
12	3
13	0
14	2
15	2
16	2
17	0
18	2
19	0
20	3
21	1
22	2
23	1
24	3
25	0
26	1
27	1
28	3
29	0
30	2
31	1
32	2
33	2
34	2
35	2
36	4
37	0
38	2
39	2
40	4
41	0
42	4
43	1
44	4
45	2
46	1
47	1
48	3
49	1
50	0
51	1
52	3
53	0
54	2
55	0
56	2
57	1
58	2
59	1
60	5
61	0
62	2
63	2
64	1
65	0
66	3
67	1
68	4
69	2
70	3
71	1
72	4
73	0
74	2
75	2
76	3
77	2
78	3
79	1
80	3
81	1
82	1
83	1
84	6
85	0
86	2
87	2
88	4
89	0
90	3

n	a(n)
1	0
2	1
3	1
4	2
5	0
6	2
7	1
8	2
9	1
10	1
11	1
12	3
13	0
14	2
15	2
16	2
17	0
18	2
19	0
20	3
21	1
22	2
23	1
24	3
25	0
26	1
27	1
28	3
29	0
30	2
31	1
32	2
33	2
34	2
35	2
36	4
37	0
38	2
39	2
40	4
41	0
42	4
43	1
44	4
45	2
46	1
47	1
48	3
49	1
50	0
51	1
52	3
53	0
54	2
55	0
56	2
57	1
58	2
59	1
60	5
61	0
62	2
63	2
64	1
65	0
66	3
67	1
68	4
69	2
70	3
71	1
72	4
73	0
74	2
75	2
76	3
77	2
78	3
79	1
80	3
81	1
82	1
83	1
84	6
85	0
86	2
87	2
88	4
89	0
90	3