A050469 - cp's OEIS frontend

A050469 a(n) = Sum_{ d divides n, n/d=1 mod 4} d - Sum_{ d divides n, n/d=3 mod 4} d.

n	a(n)
1	1
2	2
3	2
4	4
5	6
6	4
7	6
8	8
9	7
10	12
11	10
12	8
13	14
14	12
15	12
16	16
17	18
18	14
19	18
20	24
21	12
22	20
23	22
24	16
25	31
26	28
27	20
28	24
29	30
30	24
31	30
32	32
33	20
34	36
35	36
36	28
37	38
38	36
39	28
40	48
41	42
42	24
43	42
44	40
45	42
46	44
47	46
48	32
49	43
50	62
51	36
52	56
53	54
54	40
55	60
56	48
57	36
58	60
59	58
60	48
61	62
62	60
63	42
64	64
65	84
66	40

[1, 2, 2, 4, 6, 4, 6, 8, 7, 12, 10, 8, 14, 12, 12, 16, 18, 14, 18, 24, 12, 20, 22, 16, 31, 28, 20, 24, 30, 24, 30, 32, 20, 36, 36, 28, 38, 36, 28, 48, 42, 24, 42, 40, 42, 44, 46, 32, 43, 62, 36, 56, 54, 40, 60, 48, 36, 60, 58, 48, 62, 60, 42, 64, 84, 40]

cp's OEIS Frontend

A050469 a(n) = Sum_{ d divides n, n/d=1 mod 4} d - Sum_{ d divides n, n/d=3 mod 4} d.

Table of values

List of values

n	a(n)
1	1
2	2
3	2
4	4
5	6
6	4
7	6
8	8
9	7
10	12
11	10
12	8
13	14
14	12
15	12
16	16
17	18
18	14
19	18
20	24
21	12
22	20
23	22
24	16
25	31
26	28
27	20
28	24
29	30
30	24
31	30
32	32
33	20
34	36
35	36
36	28
37	38
38	36
39	28
40	48
41	42
42	24
43	42
44	40
45	42
46	44
47	46
48	32
49	43
50	62
51	36
52	56
53	54
54	40
55	60
56	48
57	36
58	60
59	58
60	48
61	62
62	60
63	42
64	64
65	84
66	40

n	a(n)
1	1
2	2
3	2
4	4
5	6
6	4
7	6
8	8
9	7
10	12
11	10
12	8
13	14
14	12
15	12
16	16
17	18
18	14
19	18
20	24
21	12
22	20
23	22
24	16
25	31
26	28
27	20
28	24
29	30
30	24
31	30
32	32
33	20
34	36
35	36
36	28
37	38
38	36
39	28
40	48
41	42
42	24
43	42
44	40
45	42
46	44
47	46
48	32
49	43
50	62
51	36
52	56
53	54
54	40
55	60
56	48
57	36
58	60
59	58
60	48
61	62
62	60
63	42
64	64
65	84
66	40

n	a(n)
1	1
2	2
3	2
4	4
5	6
6	4
7	6
8	8
9	7
10	12
11	10
12	8
13	14
14	12
15	12
16	16
17	18
18	14
19	18
20	24
21	12
22	20
23	22
24	16
25	31
26	28
27	20
28	24
29	30
30	24
31	30
32	32
33	20
34	36
35	36
36	28
37	38
38	36
39	28
40	48
41	42
42	24
43	42
44	40
45	42
46	44
47	46
48	32
49	43
50	62
51	36
52	56
53	54
54	40
55	60
56	48
57	36
58	60
59	58
60	48
61	62
62	60
63	42
64	64
65	84
66	40