A345220 - cp's OEIS frontend

A345220 Number of divisors d of n with an even number of primes not exceeding d.

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

[1, 1, 2, 2, 1, 2, 2, 3, 3, 2, 1, 3, 2, 3, 3, 4, 1, 3, 2, 4, 4, 2, 1, 4, 1, 2, 3, 4, 2, 5, 1, 4, 2, 1, 2, 4, 2, 3, 4, 6, 1, 5, 2, 4, 5, 2, 1, 5, 2, 2, 2, 3, 2, 4, 2, 6, 4, 3, 1, 7, 2, 2, 6, 5, 3, 4, 1, 2, 2, 4, 2, 6, 1, 2, 3, 4, 2, 4, 2, 8, 4, 2, 1, 6, 1, 2, 3, 5, 2, 8, 4, 4, 3]

cp's OEIS Frontend

A345220 Number of divisors d of n with an even number of primes not exceeding d.

Table of values

List of values

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

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

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