A002131 - cp's OEIS frontend

A002131 Sum of divisors d of n such that n/d is odd.

n	a(n)
1	1
2	2
3	4
4	4
5	6
6	8
7	8
8	8
9	13
10	12
11	12
12	16
13	14
14	16
15	24
16	16
17	18
18	26
19	20
20	24
21	32
22	24
23	24
24	32
25	31
26	28
27	40
28	32
29	30
30	48
31	32
32	32
33	48
34	36
35	48
36	52
37	38
38	40
39	56
40	48
41	42
42	64
43	44
44	48
45	78
46	48
47	48
48	64
49	57
50	62
51	72
52	56
53	54
54	80
55	72
56	64
57	80
58	60
59	60
60	96
61	62
62	64
63	104
64	64
65	84
66	96
67	68
68	72
69	96
70	96
71	72

[1, 2, 4, 4, 6, 8, 8, 8, 13, 12, 12, 16, 14, 16, 24, 16, 18, 26, 20, 24, 32, 24, 24, 32, 31, 28, 40, 32, 30, 48, 32, 32, 48, 36, 48, 52, 38, 40, 56, 48, 42, 64, 44, 48, 78, 48, 48, 64, 57, 62, 72, 56, 54, 80, 72, 64, 80, 60, 60, 96, 62, 64, 104, 64, 84, 96, 68, 72, 96, 96, 72]

cp's OEIS Frontend

A002131 Sum of divisors d of n such that n/d is odd.

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	4
5	6
6	8
7	8
8	8
9	13
10	12
11	12
12	16
13	14
14	16
15	24
16	16
17	18
18	26
19	20
20	24
21	32
22	24
23	24
24	32
25	31
26	28
27	40
28	32
29	30
30	48
31	32
32	32
33	48
34	36
35	48
36	52
37	38
38	40
39	56
40	48
41	42
42	64
43	44
44	48
45	78
46	48
47	48
48	64
49	57
50	62
51	72
52	56
53	54
54	80
55	72
56	64
57	80
58	60
59	60
60	96
61	62
62	64
63	104
64	64
65	84
66	96
67	68
68	72
69	96
70	96
71	72

n	a(n)
1	1
2	2
3	4
4	4
5	6
6	8
7	8
8	8
9	13
10	12
11	12
12	16
13	14
14	16
15	24
16	16
17	18
18	26
19	20
20	24
21	32
22	24
23	24
24	32
25	31
26	28
27	40
28	32
29	30
30	48
31	32
32	32
33	48
34	36
35	48
36	52
37	38
38	40
39	56
40	48
41	42
42	64
43	44
44	48
45	78
46	48
47	48
48	64
49	57
50	62
51	72
52	56
53	54
54	80
55	72
56	64
57	80
58	60
59	60
60	96
61	62
62	64
63	104
64	64
65	84
66	96
67	68
68	72
69	96
70	96
71	72

n	a(n)
1	1
2	2
3	4
4	4
5	6
6	8
7	8
8	8
9	13
10	12
11	12
12	16
13	14
14	16
15	24
16	16
17	18
18	26
19	20
20	24
21	32
22	24
23	24
24	32
25	31
26	28
27	40
28	32
29	30
30	48
31	32
32	32
33	48
34	36
35	48
36	52
37	38
38	40
39	56
40	48
41	42
42	64
43	44
44	48
45	78
46	48
47	48
48	64
49	57
50	62
51	72
52	56
53	54
54	80
55	72
56	64
57	80
58	60
59	60
60	96
61	62
62	64
63	104
64	64
65	84
66	96
67	68
68	72
69	96
70	96
71	72