A159070 - cp's OEIS frontend

A159070 Count of numbers k in the range 1 < k <= n such that set of proper divisors of k is a subset of the set of proper divisors of n.

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

[0, 1, 2, 3, 3, 5, 4, 6, 5, 6, 5, 10, 6, 8, 8, 9, 7, 11, 8, 12, 10, 10, 9, 16, 10, 11, 11, 13, 10, 17, 11, 15, 13, 13, 13, 19, 12, 14, 14, 19, 13, 19, 14, 18, 19, 16, 15, 24, 16, 19, 17, 19, 16, 22, 18, 23, 18, 18, 17, 28, 18, 20, 23, 23, 20, 24, 19, 23, 21, 26, 20, 31, 21, 23, 25, 25]

cp's OEIS Frontend

A159070 Count of numbers k in the range 1 < k <= n such that set of proper divisors of k is a subset of the set of proper divisors of n.

Table of values

List of values

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

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

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