A070548 - cp's OEIS frontend

A070548 a(n) = Cardinality{ k in range 1 <= k <= n such that Moebius(k) = 1 }.

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

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

cp's OEIS Frontend

A070548 a(n) = Cardinality{ k in range 1 <= k <= n such that Moebius(k) = 1 }.

Table of values

List of values

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

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

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