A306408 - cp's OEIS frontend

A306408 a(n) = Sum_{d|n} (-1)^omega(n/d) * d.

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

[1, 1, 2, 1, 4, 2, 6, 1, 5, 4, 10, 2, 12, 6, 8, 1, 16, 5, 18, 4, 12, 10, 22, 2, 19, 12, 14, 6, 28, 8, 30, 1, 20, 16, 24, 5, 36, 18, 24, 4, 40, 12, 42, 10, 20, 22, 46, 2, 41, 19, 32, 12, 52, 14, 40, 6, 36, 28, 58, 8, 60, 30, 30, 1, 48, 20, 66, 16, 44, 24, 70, 5, 72]

cp's OEIS Frontend

A306408 a(n) = Sum_{d|n} (-1)^omega(n/d) * d.

Table of values

List of values

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

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

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