A345219 - cp's OEIS frontend

A345219 Number of divisors d of n with an odd number of primes not exceeding d.

n	a(n)
1	0
2	1
3	0
4	1
5	1
6	2
7	0
8	1
9	0
10	2
11	1
12	3
13	0
14	1
15	1
16	1
17	1
18	3
19	0
20	2
21	0
22	2
23	1
24	4
25	2
26	2
27	1
28	2
29	0
30	3
31	1
32	2
33	2
34	3
35	2
36	5
37	0
38	1
39	0
40	2
41	1
42	3
43	0
44	2
45	1
46	2
47	1
48	5
49	1
50	4
51	2
52	3
53	0
54	4
55	2
56	2
57	0
58	1
59	1
60	5
61	0
62	2
63	0
64	2
65	1
66	4
67	1
68	4
69	2
70	4
71	0
72	6
73	1
74	2
75	3
76	2
77	2
78	4
79	0
80	2
81	1
82	2
83	1
84	6
85	3
86	2
87	1
88	3
89	0
90	4
91	0
92	2
93	1

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

cp's OEIS Frontend

A345219 Number of divisors d of n with an odd number of primes not exceeding d.

Table of values

List of values

n	a(n)
1	0
2	1
3	0
4	1
5	1
6	2
7	0
8	1
9	0
10	2
11	1
12	3
13	0
14	1
15	1
16	1
17	1
18	3
19	0
20	2
21	0
22	2
23	1
24	4
25	2
26	2
27	1
28	2
29	0
30	3
31	1
32	2
33	2
34	3
35	2
36	5
37	0
38	1
39	0
40	2
41	1
42	3
43	0
44	2
45	1
46	2
47	1
48	5
49	1
50	4
51	2
52	3
53	0
54	4
55	2
56	2
57	0
58	1
59	1
60	5
61	0
62	2
63	0
64	2
65	1
66	4
67	1
68	4
69	2
70	4
71	0
72	6
73	1
74	2
75	3
76	2
77	2
78	4
79	0
80	2
81	1
82	2
83	1
84	6
85	3
86	2
87	1
88	3
89	0
90	4
91	0
92	2
93	1

n	a(n)
1	0
2	1
3	0
4	1
5	1
6	2
7	0
8	1
9	0
10	2
11	1
12	3
13	0
14	1
15	1
16	1
17	1
18	3
19	0
20	2
21	0
22	2
23	1
24	4
25	2
26	2
27	1
28	2
29	0
30	3
31	1
32	2
33	2
34	3
35	2
36	5
37	0
38	1
39	0
40	2
41	1
42	3
43	0
44	2
45	1
46	2
47	1
48	5
49	1
50	4
51	2
52	3
53	0
54	4
55	2
56	2
57	0
58	1
59	1
60	5
61	0
62	2
63	0
64	2
65	1
66	4
67	1
68	4
69	2
70	4
71	0
72	6
73	1
74	2
75	3
76	2
77	2
78	4
79	0
80	2
81	1
82	2
83	1
84	6
85	3
86	2
87	1
88	3
89	0
90	4
91	0
92	2
93	1

n	a(n)
1	0
2	1
3	0
4	1
5	1
6	2
7	0
8	1
9	0
10	2
11	1
12	3
13	0
14	1
15	1
16	1
17	1
18	3
19	0
20	2
21	0
22	2
23	1
24	4
25	2
26	2
27	1
28	2
29	0
30	3
31	1
32	2
33	2
34	3
35	2
36	5
37	0
38	1
39	0
40	2
41	1
42	3
43	0
44	2
45	1
46	2
47	1
48	5
49	1
50	4
51	2
52	3
53	0
54	4
55	2
56	2
57	0
58	1
59	1
60	5
61	0
62	2
63	0
64	2
65	1
66	4
67	1
68	4
69	2
70	4
71	0
72	6
73	1
74	2
75	3
76	2
77	2
78	4
79	0
80	2
81	1
82	2
83	1
84	6
85	3
86	2
87	1
88	3
89	0
90	4
91	0
92	2
93	1