A318326 - cp's OEIS frontend

A318326 a(n) = Sum_{d|n} [moebius(n/d) < 0]*(sigma(d)-d).

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	2
7	0
8	3
9	1
10	2
11	0
12	9
13	0
14	2
15	2
16	7
17	0
18	10
19	0
20	11
21	2
22	2
23	0
24	23
25	1
26	2
27	4
28	13
29	0
30	23
31	0
32	15
33	2
34	2
35	2
36	37
37	0
38	2
39	2
40	29
41	0
42	27
43	0
44	17
45	13
46	2
47	0
48	51
49	1
50	14
51	2
52	19
53	0
54	34
55	2
56	35
57	2
58	2
59	0
60	81
61	0
62	2
63	15
64	31
65	2
66	35
67	0
68	23
69	2
70	31
71	0
72	91
73	0
74	2
75	15
76	25
77	2
78	39
79	0
80	65
81	13
82	2
83	0
84	99
85	2
86	2
87	2
88	47
89	0
90	97
91	2
92	29
93	2
94	2
95	2
96	107
97	0
98	18
99	19
100	65
101	0
102	47

[0, 0, 0, 1, 0, 2, 0, 3, 1, 2, 0, 9, 0, 2, 2, 7, 0, 10, 0, 11, 2, 2, 0, 23, 1, 2, 4, 13, 0, 23, 0, 15, 2, 2, 2, 37, 0, 2, 2, 29, 0, 27, 0, 17, 13, 2, 0, 51, 1, 14, 2, 19, 0, 34, 2, 35, 2, 2, 0, 81, 0, 2, 15, 31, 2, 35, 0, 23, 2, 31, 0, 91, 0, 2, 15, 25, 2, 39, 0, 65, 13, 2, 0, 99, 2, 2, 2, 47, 0, 97, 2, 29, 2, 2, 2, 107, 0, 18, 19, 65, 0, 47]

cp's OEIS Frontend

A318326 a(n) = Sum_{d|n} [moebius(n/d) < 0]*(sigma(d)-d).

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	2
7	0
8	3
9	1
10	2
11	0
12	9
13	0
14	2
15	2
16	7
17	0
18	10
19	0
20	11
21	2
22	2
23	0
24	23
25	1
26	2
27	4
28	13
29	0
30	23
31	0
32	15
33	2
34	2
35	2
36	37
37	0
38	2
39	2
40	29
41	0
42	27
43	0
44	17
45	13
46	2
47	0
48	51
49	1
50	14
51	2
52	19
53	0
54	34
55	2
56	35
57	2
58	2
59	0
60	81
61	0
62	2
63	15
64	31
65	2
66	35
67	0
68	23
69	2
70	31
71	0
72	91
73	0
74	2
75	15
76	25
77	2
78	39
79	0
80	65
81	13
82	2
83	0
84	99
85	2
86	2
87	2
88	47
89	0
90	97
91	2
92	29
93	2
94	2
95	2
96	107
97	0
98	18
99	19
100	65
101	0
102	47

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	2
7	0
8	3
9	1
10	2
11	0
12	9
13	0
14	2
15	2
16	7
17	0
18	10
19	0
20	11
21	2
22	2
23	0
24	23
25	1
26	2
27	4
28	13
29	0
30	23
31	0
32	15
33	2
34	2
35	2
36	37
37	0
38	2
39	2
40	29
41	0
42	27
43	0
44	17
45	13
46	2
47	0
48	51
49	1
50	14
51	2
52	19
53	0
54	34
55	2
56	35
57	2
58	2
59	0
60	81
61	0
62	2
63	15
64	31
65	2
66	35
67	0
68	23
69	2
70	31
71	0
72	91
73	0
74	2
75	15
76	25
77	2
78	39
79	0
80	65
81	13
82	2
83	0
84	99
85	2
86	2
87	2
88	47
89	0
90	97
91	2
92	29
93	2
94	2
95	2
96	107
97	0
98	18
99	19
100	65
101	0
102	47

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	2
7	0
8	3
9	1
10	2
11	0
12	9
13	0
14	2
15	2
16	7
17	0
18	10
19	0
20	11
21	2
22	2
23	0
24	23
25	1
26	2
27	4
28	13
29	0
30	23
31	0
32	15
33	2
34	2
35	2
36	37
37	0
38	2
39	2
40	29
41	0
42	27
43	0
44	17
45	13
46	2
47	0
48	51
49	1
50	14
51	2
52	19
53	0
54	34
55	2
56	35
57	2
58	2
59	0
60	81
61	0
62	2
63	15
64	31
65	2
66	35
67	0
68	23
69	2
70	31
71	0
72	91
73	0
74	2
75	15
76	25
77	2
78	39
79	0
80	65
81	13
82	2
83	0
84	99
85	2
86	2
87	2
88	47
89	0
90	97
91	2
92	29
93	2
94	2
95	2
96	107
97	0
98	18
99	19
100	65
101	0
102	47