A335022 - cp's OEIS frontend

A335022 a(n) = Sum_{d|n, 1 < d < n} (-1)^(d + 1) * d.

n	a(n)
1	0
2	0
3	0
4	-2
5	0
6	1
7	0
8	-6
9	3
10	3
11	0
12	-9
13	0
14	5
15	8
16	-14
17	0
18	4
19	0
20	-11
21	10
22	9
23	0
24	-29
25	5
26	11
27	12
28	-13
29	0
30	5
31	0
32	-30
33	14
34	15
35	12
36	-30
37	0
38	17
39	16
40	-39
41	0
42	9
43	0
44	-17
45	32
46	21
47	0
48	-69
49	7
50	18
51	20
52	-19
53	0
54	13
55	16
56	-49
57	22
58	27
59	0
60	-61
61	0
62	29
63	40
64	-62
65	18
66	17
67	0
68	-23
69	26
70	21
71	0
72	-98
73	0
74	35
75	48
76	-25

[0, 0, 0, -2, 0, 1, 0, -6, 3, 3, 0, -9, 0, 5, 8, -14, 0, 4, 0, -11, 10, 9, 0, -29, 5, 11, 12, -13, 0, 5, 0, -30, 14, 15, 12, -30, 0, 17, 16, -39, 0, 9, 0, -17, 32, 21, 0, -69, 7, 18, 20, -19, 0, 13, 16, -49, 22, 27, 0, -61, 0, 29, 40, -62, 18, 17, 0, -23, 26, 21, 0, -98, 0, 35, 48, -25]

cp's OEIS Frontend

A335022 a(n) = Sum_{d|n, 1 < d < n} (-1)^(d + 1) * d.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	-2
5	0
6	1
7	0
8	-6
9	3
10	3
11	0
12	-9
13	0
14	5
15	8
16	-14
17	0
18	4
19	0
20	-11
21	10
22	9
23	0
24	-29
25	5
26	11
27	12
28	-13
29	0
30	5
31	0
32	-30
33	14
34	15
35	12
36	-30
37	0
38	17
39	16
40	-39
41	0
42	9
43	0
44	-17
45	32
46	21
47	0
48	-69
49	7
50	18
51	20
52	-19
53	0
54	13
55	16
56	-49
57	22
58	27
59	0
60	-61
61	0
62	29
63	40
64	-62
65	18
66	17
67	0
68	-23
69	26
70	21
71	0
72	-98
73	0
74	35
75	48
76	-25

n	a(n)
1	0
2	0
3	0
4	-2
5	0
6	1
7	0
8	-6
9	3
10	3
11	0
12	-9
13	0
14	5
15	8
16	-14
17	0
18	4
19	0
20	-11
21	10
22	9
23	0
24	-29
25	5
26	11
27	12
28	-13
29	0
30	5
31	0
32	-30
33	14
34	15
35	12
36	-30
37	0
38	17
39	16
40	-39
41	0
42	9
43	0
44	-17
45	32
46	21
47	0
48	-69
49	7
50	18
51	20
52	-19
53	0
54	13
55	16
56	-49
57	22
58	27
59	0
60	-61
61	0
62	29
63	40
64	-62
65	18
66	17
67	0
68	-23
69	26
70	21
71	0
72	-98
73	0
74	35
75	48
76	-25

n	a(n)
1	0
2	0
3	0
4	-2
5	0
6	1
7	0
8	-6
9	3
10	3
11	0
12	-9
13	0
14	5
15	8
16	-14
17	0
18	4
19	0
20	-11
21	10
22	9
23	0
24	-29
25	5
26	11
27	12
28	-13
29	0
30	5
31	0
32	-30
33	14
34	15
35	12
36	-30
37	0
38	17
39	16
40	-39
41	0
42	9
43	0
44	-17
45	32
46	21
47	0
48	-69
49	7
50	18
51	20
52	-19
53	0
54	13
55	16
56	-49
57	22
58	27
59	0
60	-61
61	0
62	29
63	40
64	-62
65	18
66	17
67	0
68	-23
69	26
70	21
71	0
72	-98
73	0
74	35
75	48
76	-25