A158974 - cp's OEIS frontend

A158974 a(n) is the number of numbers k <= n such that not all proper divisors of k are divisors of n.

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

[0, 0, 0, 0, 1, 0, 2, 1, 3, 3, 5, 1, 6, 5, 6, 6, 9, 6, 10, 7, 10, 11, 13, 7, 14, 14, 15, 14, 18, 12, 19, 16, 19, 20, 21, 16, 24, 23, 24, 20, 27, 22, 28, 25, 25, 29, 31, 23, 32, 30, 33, 32, 36, 31, 36, 32, 38, 39, 41, 31, 42, 41, 39, 40, 44, 41, 47, 44, 47, 43, 50, 40, 51, 50, 49, 50]

cp's OEIS Frontend

A158974 a(n) is the number of numbers k <= n such that not all proper divisors of k are divisors of n.

Table of values

List of values

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

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

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