A281009 - cp's OEIS frontend

A281009 Number of odd divisors of n minus the number of middle divisors of n.

n	a(n)
1	0
2	0
3	2
4	0
5	2
6	0
7	2
8	0
9	2
10	2
11	2
12	0
13	2
14	2
15	2
16	0
17	2
18	2
19	2
20	0
21	4
22	2
23	2
24	0
25	2
26	2
27	4
28	0
29	2
30	2
31	2
32	0
33	4
34	2
35	2
36	2
37	2
38	2
39	4
40	0
41	2
42	2
43	2
44	2
45	4
46	2
47	2
48	0
49	2
50	2
51	4
52	2
53	2
54	2
55	4
56	0
57	4
58	2
59	2
60	2
61	2
62	2
63	4
64	0
65	4
66	2
67	2
68	2
69	4
70	2
71	2
72	0
73	2
74	2
75	6
76	2
77	2
78	4
79	2
80	0
81	4
82	2
83	2
84	2
85	4
86	2
87	4
88	0
89	2
90	4
91	2
92	2
93	4
94	2
95	4
96	0
97	2
98	2
99	4
100	2
101	2
102	4
103	2
104	0
105	8

[0, 0, 2, 0, 2, 0, 2, 0, 2, 2, 2, 0, 2, 2, 2, 0, 2, 2, 2, 0, 4, 2, 2, 0, 2, 2, 4, 0, 2, 2, 2, 0, 4, 2, 2, 2, 2, 2, 4, 0, 2, 2, 2, 2, 4, 2, 2, 0, 2, 2, 4, 2, 2, 2, 4, 0, 4, 2, 2, 2, 2, 2, 4, 0, 4, 2, 2, 2, 4, 2, 2, 0, 2, 2, 6, 2, 2, 4, 2, 0, 4, 2, 2, 2, 4, 2, 4, 0, 2, 4, 2, 2, 4, 2, 4, 0, 2, 2, 4, 2, 2, 4, 2, 0, 8]

cp's OEIS Frontend

A281009 Number of odd divisors of n minus the number of middle divisors of n.

Table of values

List of values

n	a(n)
1	0
2	0
3	2
4	0
5	2
6	0
7	2
8	0
9	2
10	2
11	2
12	0
13	2
14	2
15	2
16	0
17	2
18	2
19	2
20	0
21	4
22	2
23	2
24	0
25	2
26	2
27	4
28	0
29	2
30	2
31	2
32	0
33	4
34	2
35	2
36	2
37	2
38	2
39	4
40	0
41	2
42	2
43	2
44	2
45	4
46	2
47	2
48	0
49	2
50	2
51	4
52	2
53	2
54	2
55	4
56	0
57	4
58	2
59	2
60	2
61	2
62	2
63	4
64	0
65	4
66	2
67	2
68	2
69	4
70	2
71	2
72	0
73	2
74	2
75	6
76	2
77	2
78	4
79	2
80	0
81	4
82	2
83	2
84	2
85	4
86	2
87	4
88	0
89	2
90	4
91	2
92	2
93	4
94	2
95	4
96	0
97	2
98	2
99	4
100	2
101	2
102	4
103	2
104	0
105	8

n	a(n)
1	0
2	0
3	2
4	0
5	2
6	0
7	2
8	0
9	2
10	2
11	2
12	0
13	2
14	2
15	2
16	0
17	2
18	2
19	2
20	0
21	4
22	2
23	2
24	0
25	2
26	2
27	4
28	0
29	2
30	2
31	2
32	0
33	4
34	2
35	2
36	2
37	2
38	2
39	4
40	0
41	2
42	2
43	2
44	2
45	4
46	2
47	2
48	0
49	2
50	2
51	4
52	2
53	2
54	2
55	4
56	0
57	4
58	2
59	2
60	2
61	2
62	2
63	4
64	0
65	4
66	2
67	2
68	2
69	4
70	2
71	2
72	0
73	2
74	2
75	6
76	2
77	2
78	4
79	2
80	0
81	4
82	2
83	2
84	2
85	4
86	2
87	4
88	0
89	2
90	4
91	2
92	2
93	4
94	2
95	4
96	0
97	2
98	2
99	4
100	2
101	2
102	4
103	2
104	0
105	8

n	a(n)
1	0
2	0
3	2
4	0
5	2
6	0
7	2
8	0
9	2
10	2
11	2
12	0
13	2
14	2
15	2
16	0
17	2
18	2
19	2
20	0
21	4
22	2
23	2
24	0
25	2
26	2
27	4
28	0
29	2
30	2
31	2
32	0
33	4
34	2
35	2
36	2
37	2
38	2
39	4
40	0
41	2
42	2
43	2
44	2
45	4
46	2
47	2
48	0
49	2
50	2
51	4
52	2
53	2
54	2
55	4
56	0
57	4
58	2
59	2
60	2
61	2
62	2
63	4
64	0
65	4
66	2
67	2
68	2
69	4
70	2
71	2
72	0
73	2
74	2
75	6
76	2
77	2
78	4
79	2
80	0
81	4
82	2
83	2
84	2
85	4
86	2
87	4
88	0
89	2
90	4
91	2
92	2
93	4
94	2
95	4
96	0
97	2
98	2
99	4
100	2
101	2
102	4
103	2
104	0
105	8