A161840 - cp's OEIS frontend

A161840 Number of noncentral divisors of n.

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

[0, 0, 0, 2, 0, 2, 0, 2, 2, 2, 0, 4, 0, 2, 2, 4, 0, 4, 0, 4, 2, 2, 0, 6, 2, 2, 2, 4, 0, 6, 0, 4, 2, 2, 2, 8, 0, 2, 2, 6, 0, 6, 0, 4, 4, 2, 0, 8, 2, 4, 2, 4, 0, 6, 2, 6, 2, 2, 0, 10, 0, 2, 4, 6, 2, 6, 0, 4, 2, 6, 0, 10, 0, 2, 4, 4, 2, 6, 0, 8, 4, 2, 0, 10, 2, 2, 2, 6, 0, 10, 2, 4, 2, 2, 2, 10, 0, 4, 4, 8]

cp's OEIS Frontend

A161840 Number of noncentral divisors of n.

Table of values

List of values

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

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

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