A047983 - cp's OEIS frontend

A047983 Number of integers less than n but with the same number of divisors.

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

[0, 0, 1, 0, 2, 0, 3, 1, 1, 2, 4, 0, 5, 3, 4, 0, 6, 1, 7, 2, 5, 6, 8, 0, 2, 7, 8, 3, 9, 1, 10, 4, 9, 10, 11, 0, 11, 12, 13, 2, 12, 3, 13, 5, 6, 14, 14, 0, 3, 7, 15, 8, 15, 4, 16, 5, 17, 18, 16, 0, 17, 19, 9, 0, 20, 6, 18, 10, 21, 7, 19, 1, 20, 22, 11, 12, 23, 8, 21, 1, 1, 24, 22, 2, 25, 26, 27]

cp's OEIS Frontend

A047983 Number of integers less than n but with the same number of divisors.

Table of values

List of values

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

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

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