A300718 - cp's OEIS frontend

A300718 Möbius transform of A010848, number of numbers k <= n such that at least one prime factor of n is not a prime factor of k.

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

[0, 1, 2, 1, 4, 2, 6, 2, 4, 4, 10, 4, 12, 6, 8, 4, 16, 6, 18, 8, 12, 10, 22, 8, 16, 12, 12, 12, 28, 8, 30, 8, 20, 16, 24, 10, 36, 18, 24, 16, 40, 12, 42, 20, 24, 22, 46, 16, 36, 20, 32, 24, 52, 18, 40, 24, 36, 28, 58, 16, 60, 30, 36, 16, 48, 20, 66, 32, 44, 24, 70, 20, 72, 36, 40, 36, 60, 24, 78, 32, 36, 40, 82, 24, 64, 42, 56, 40, 88, 24, 72]

cp's OEIS Frontend

A300718 Möbius transform of A010848, number of numbers k <= n such that at least one prime factor of n is not a prime factor of k.

Table of values

List of values

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

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

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