A186643 - cp's OEIS frontend

A186643 The number of divisors d of n which are either d=1 or for which the highest power d^k dividing n has odd exponent k.

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

[1, 2, 2, 2, 2, 4, 2, 4, 2, 4, 2, 5, 2, 4, 4, 3, 2, 5, 2, 5, 4, 4, 2, 8, 2, 4, 4, 5, 2, 8, 2, 5, 4, 4, 4, 6, 2, 4, 4, 8, 2, 8, 2, 5, 5, 4, 2, 8, 2, 5, 4, 5, 2, 8, 4, 8, 4, 4, 2, 11, 2, 4, 5, 5, 4, 8, 2, 5, 4, 8, 2, 10, 2, 4, 5, 5, 4, 8, 2, 8]

cp's OEIS Frontend

A186643 The number of divisors d of n which are either d=1 or for which the highest power d^k dividing n has odd exponent k.

Table of values

List of values

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

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

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