A088004 - cp's OEIS frontend

A088004 "Truncated Mertens function": values of -1 at primes are left out, that is, summatory Moebius when argument runs through nonprimes.

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	7
31	7
32	7
33	8
34	9
35	10
36	10
37	10
38	11
39	12
40	12
41	12
42	11
43	11
44	11
45	11
46	12
47	12
48	12
49	12
50	12
51	13
52	13
53	13
54	13
55	14
56	14
57	15
58	16
59	16
60	16
61	16
62	17
63	17
64	17
65	18
66	17
67	17
68	17
69	18
70	17
71	17
72	17
73	17
74	18
75	18
76	18
77	19
78	18
79	18
80	18
81	18

[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, 7, 7, 7, 8, 9, 10, 10, 10, 11, 12, 12, 12, 11, 11, 11, 11, 12, 12, 12, 12, 12, 13, 13, 13, 13, 14, 14, 15, 16, 16, 16, 16, 17, 17, 17, 18, 17, 17, 17, 18, 17, 17, 17, 17, 18, 18, 18, 19, 18, 18, 18, 18]

cp's OEIS Frontend

A088004 "Truncated Mertens function": values of -1 at primes are left out, that is, summatory Moebius when argument runs through nonprimes.

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	7
31	7
32	7
33	8
34	9
35	10
36	10
37	10
38	11
39	12
40	12
41	12
42	11
43	11
44	11
45	11
46	12
47	12
48	12
49	12
50	12
51	13
52	13
53	13
54	13
55	14
56	14
57	15
58	16
59	16
60	16
61	16
62	17
63	17
64	17
65	18
66	17
67	17
68	17
69	18
70	17
71	17
72	17
73	17
74	18
75	18
76	18
77	19
78	18
79	18
80	18
81	18

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	7
31	7
32	7
33	8
34	9
35	10
36	10
37	10
38	11
39	12
40	12
41	12
42	11
43	11
44	11
45	11
46	12
47	12
48	12
49	12
50	12
51	13
52	13
53	13
54	13
55	14
56	14
57	15
58	16
59	16
60	16
61	16
62	17
63	17
64	17
65	18
66	17
67	17
68	17
69	18
70	17
71	17
72	17
73	17
74	18
75	18
76	18
77	19
78	18
79	18
80	18
81	18

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	7
31	7
32	7
33	8
34	9
35	10
36	10
37	10
38	11
39	12
40	12
41	12
42	11
43	11
44	11
45	11
46	12
47	12
48	12
49	12
50	12
51	13
52	13
53	13
54	13
55	14
56	14
57	15
58	16
59	16
60	16
61	16
62	17
63	17
64	17
65	18
66	17
67	17
68	17
69	18
70	17
71	17
72	17
73	17
74	18
75	18
76	18
77	19
78	18
79	18
80	18
81	18