A181549 - cp's OEIS frontend

A181549 a(n) = Sum_{k|n} k*mu_2(n/k).

n	a(n)
0	0
1	1
2	3
3	4
4	5
5	6
6	12
7	8
8	10
9	11
10	18
11	12
12	20
13	14
14	24
15	24
16	20
17	18
18	33
19	20
20	30
21	32
22	36
23	24
24	40
25	29
26	42
27	33
28	40
29	30
30	72
31	32
32	40
33	48
34	54
35	48
36	55
37	38
38	60
39	56
40	60
41	42
42	96
43	44
44	60
45	66
46	72
47	48
48	80
49	55
50	87
51	72
52	70
53	54
54	99
55	72
56	80
57	80
58	90
59	60

[0, 1, 3, 4, 5, 6, 12, 8, 10, 11, 18, 12, 20, 14, 24, 24, 20, 18, 33, 20, 30, 32, 36, 24, 40, 29, 42, 33, 40, 30, 72, 32, 40, 48, 54, 48, 55, 38, 60, 56, 60, 42, 96, 44, 60, 66, 72, 48, 80, 55, 87, 72, 70, 54, 99, 72, 80, 80, 90, 60]

cp's OEIS Frontend

A181549 a(n) = Sum_{k|n} k*mu_2(n/k).

Table of values

List of values

n	a(n)
0	0
1	1
2	3
3	4
4	5
5	6
6	12
7	8
8	10
9	11
10	18
11	12
12	20
13	14
14	24
15	24
16	20
17	18
18	33
19	20
20	30
21	32
22	36
23	24
24	40
25	29
26	42
27	33
28	40
29	30
30	72
31	32
32	40
33	48
34	54
35	48
36	55
37	38
38	60
39	56
40	60
41	42
42	96
43	44
44	60
45	66
46	72
47	48
48	80
49	55
50	87
51	72
52	70
53	54
54	99
55	72
56	80
57	80
58	90
59	60

n	a(n)
0	0
1	1
2	3
3	4
4	5
5	6
6	12
7	8
8	10
9	11
10	18
11	12
12	20
13	14
14	24
15	24
16	20
17	18
18	33
19	20
20	30
21	32
22	36
23	24
24	40
25	29
26	42
27	33
28	40
29	30
30	72
31	32
32	40
33	48
34	54
35	48
36	55
37	38
38	60
39	56
40	60
41	42
42	96
43	44
44	60
45	66
46	72
47	48
48	80
49	55
50	87
51	72
52	70
53	54
54	99
55	72
56	80
57	80
58	90
59	60

n	a(n)
0	0
1	1
2	3
3	4
4	5
5	6
6	12
7	8
8	10
9	11
10	18
11	12
12	20
13	14
14	24
15	24
16	20
17	18
18	33
19	20
20	30
21	32
22	36
23	24
24	40
25	29
26	42
27	33
28	40
29	30
30	72
31	32
32	40
33	48
34	54
35	48
36	55
37	38
38	60
39	56
40	60
41	42
42	96
43	44
44	60
45	66
46	72
47	48
48	80
49	55
50	87
51	72
52	70
53	54
54	99
55	72
56	80
57	80
58	90
59	60