A068101 - cp's OEIS frontend

A068101 a(n) = Sum_{k|n, k<=sqrt(n)} mu(k) where mu(k) is the Moebius function and the sum is over the positive divisors k of n with k <= sqrt(n).

n	a(n)
1	1
2	1
3	1
4	0
5	1
6	0
7	1
8	0
9	0
10	0
11	1
12	-1
13	1
14	0
15	0
16	0
17	1
18	-1
19	1
20	0
21	0
22	0
23	1
24	-1
25	0
26	0
27	0
28	0
29	1
30	-2
31	1
32	0
33	0
34	0
35	0
36	0
37	1
38	0
39	0
40	-1
41	1
42	0
43	1
44	0
45	-1
46	0
47	1
48	0
49	0
50	-1
51	0
52	0
53	1
54	0
55	0
56	-1
57	0
58	0
59	1
60	-1
61	1
62	0
63	-1
64	0
65	0
66	0
67	1
68	0
69	0
70	-2
71	1
72	0
73	1
74	0
75	-1
76	0
77	0
78	0
79	1
80	-1
81	0
82	0
83	1
84	-1
85	0
86	0
87	0
88	0
89	1
90	-1
91	0
92	0
93	0
94	0
95	0
96	0
97	1
98	-1
99	0
100	0
101	1
102	0
103	1

[1, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, -1, 1, 0, 0, 0, 1, -1, 1, 0, 0, 0, 1, -1, 0, 0, 0, 0, 1, -2, 1, 0, 0, 0, 0, 0, 1, 0, 0, -1, 1, 0, 1, 0, -1, 0, 1, 0, 0, -1, 0, 0, 1, 0, 0, -1, 0, 0, 1, -1, 1, 0, -1, 0, 0, 0, 1, 0, 0, -2, 1, 0, 1, 0, -1, 0, 0, 0, 1, -1, 0, 0, 1, -1, 0, 0, 0, 0, 1, -1, 0, 0, 0, 0, 0, 0, 1, -1, 0, 0, 1, 0, 1]

cp's OEIS Frontend

A068101 a(n) = Sum_{k|n, k<=sqrt(n)} mu(k) where mu(k) is the Moebius function and the sum is over the positive divisors k of n with k <= sqrt(n).

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	0
5	1
6	0
7	1
8	0
9	0
10	0
11	1
12	-1
13	1
14	0
15	0
16	0
17	1
18	-1
19	1
20	0
21	0
22	0
23	1
24	-1
25	0
26	0
27	0
28	0
29	1
30	-2
31	1
32	0
33	0
34	0
35	0
36	0
37	1
38	0
39	0
40	-1
41	1
42	0
43	1
44	0
45	-1
46	0
47	1
48	0
49	0
50	-1
51	0
52	0
53	1
54	0
55	0
56	-1
57	0
58	0
59	1
60	-1
61	1
62	0
63	-1
64	0
65	0
66	0
67	1
68	0
69	0
70	-2
71	1
72	0
73	1
74	0
75	-1
76	0
77	0
78	0
79	1
80	-1
81	0
82	0
83	1
84	-1
85	0
86	0
87	0
88	0
89	1
90	-1
91	0
92	0
93	0
94	0
95	0
96	0
97	1
98	-1
99	0
100	0
101	1
102	0
103	1

n	a(n)
1	1
2	1
3	1
4	0
5	1
6	0
7	1
8	0
9	0
10	0
11	1
12	-1
13	1
14	0
15	0
16	0
17	1
18	-1
19	1
20	0
21	0
22	0
23	1
24	-1
25	0
26	0
27	0
28	0
29	1
30	-2
31	1
32	0
33	0
34	0
35	0
36	0
37	1
38	0
39	0
40	-1
41	1
42	0
43	1
44	0
45	-1
46	0
47	1
48	0
49	0
50	-1
51	0
52	0
53	1
54	0
55	0
56	-1
57	0
58	0
59	1
60	-1
61	1
62	0
63	-1
64	0
65	0
66	0
67	1
68	0
69	0
70	-2
71	1
72	0
73	1
74	0
75	-1
76	0
77	0
78	0
79	1
80	-1
81	0
82	0
83	1
84	-1
85	0
86	0
87	0
88	0
89	1
90	-1
91	0
92	0
93	0
94	0
95	0
96	0
97	1
98	-1
99	0
100	0
101	1
102	0
103	1

n	a(n)
1	1
2	1
3	1
4	0
5	1
6	0
7	1
8	0
9	0
10	0
11	1
12	-1
13	1
14	0
15	0
16	0
17	1
18	-1
19	1
20	0
21	0
22	0
23	1
24	-1
25	0
26	0
27	0
28	0
29	1
30	-2
31	1
32	0
33	0
34	0
35	0
36	0
37	1
38	0
39	0
40	-1
41	1
42	0
43	1
44	0
45	-1
46	0
47	1
48	0
49	0
50	-1
51	0
52	0
53	1
54	0
55	0
56	-1
57	0
58	0
59	1
60	-1
61	1
62	0
63	-1
64	0
65	0
66	0
67	1
68	0
69	0
70	-2
71	1
72	0
73	1
74	0
75	-1
76	0
77	0
78	0
79	1
80	-1
81	0
82	0
83	1
84	-1
85	0
86	0
87	0
88	0
89	1
90	-1
91	0
92	0
93	0
94	0
95	0
96	0
97	1
98	-1
99	0
100	0
101	1
102	0
103	1