A032741 - cp's OEIS frontend

A032741 a(0) = 0; for n > 0, a(n) = number of proper divisors of n (divisors of n which are less than n).

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

[0, 0, 1, 1, 2, 1, 3, 1, 3, 2, 3, 1, 5, 1, 3, 3, 4, 1, 5, 1, 5, 3, 3, 1, 7, 2, 3, 3, 5, 1, 7, 1, 5, 3, 3, 3, 8, 1, 3, 3, 7, 1, 7, 1, 5, 5, 3, 1, 9, 2, 5, 3, 5, 1, 7, 3, 7, 3, 3, 1, 11, 1, 3, 5, 6, 3, 7, 1, 5, 3, 7, 1, 11, 1, 3, 5, 5, 3, 7, 1, 9, 4, 3, 1, 11, 3, 3, 3, 7, 1, 11, 3, 5, 3, 3, 3, 11, 1, 5, 5]

cp's OEIS Frontend

A032741 a(0) = 0; for n > 0, a(n) = number of proper divisors of n (divisors of n which are less than n).

Table of values

List of values

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

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

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