A300657 - cp's OEIS frontend

A300657 a(n) = Sum_{d|n} sigma(d) mod d.

n	a(n)
1	0
2	1
3	1
4	4
5	1
6	2
7	1
8	11
9	5
10	10
11	1
12	9
13	1
14	12
15	11
16	26
17	1
18	9
19	1
20	15
21	13
22	16
23	1
24	28
25	7
26	18
27	18
28	15
29	1
30	32
31	1
32	57
33	17
34	22
35	15
36	35
37	1
38	24
39	19
40	32
41	1
42	36
43	1
44	59
45	48
46	28
47	1
48	71
49	9
50	59
51	23
52	67
53	1
54	34
55	19
56	30
57	25
58	34
59	1
60	89
61	1
62	36
63	58
64	120
65	21
66	44
67	1
68	83
69	29
70	38
71	1
72	105

[0, 1, 1, 4, 1, 2, 1, 11, 5, 10, 1, 9, 1, 12, 11, 26, 1, 9, 1, 15, 13, 16, 1, 28, 7, 18, 18, 15, 1, 32, 1, 57, 17, 22, 15, 35, 1, 24, 19, 32, 1, 36, 1, 59, 48, 28, 1, 71, 9, 59, 23, 67, 1, 34, 19, 30, 25, 34, 1, 89, 1, 36, 58, 120, 21, 44, 1, 83, 29, 38, 1, 105]

cp's OEIS Frontend

A300657 a(n) = Sum_{d|n} sigma(d) mod d.

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	4
5	1
6	2
7	1
8	11
9	5
10	10
11	1
12	9
13	1
14	12
15	11
16	26
17	1
18	9
19	1
20	15
21	13
22	16
23	1
24	28
25	7
26	18
27	18
28	15
29	1
30	32
31	1
32	57
33	17
34	22
35	15
36	35
37	1
38	24
39	19
40	32
41	1
42	36
43	1
44	59
45	48
46	28
47	1
48	71
49	9
50	59
51	23
52	67
53	1
54	34
55	19
56	30
57	25
58	34
59	1
60	89
61	1
62	36
63	58
64	120
65	21
66	44
67	1
68	83
69	29
70	38
71	1
72	105

n	a(n)
1	0
2	1
3	1
4	4
5	1
6	2
7	1
8	11
9	5
10	10
11	1
12	9
13	1
14	12
15	11
16	26
17	1
18	9
19	1
20	15
21	13
22	16
23	1
24	28
25	7
26	18
27	18
28	15
29	1
30	32
31	1
32	57
33	17
34	22
35	15
36	35
37	1
38	24
39	19
40	32
41	1
42	36
43	1
44	59
45	48
46	28
47	1
48	71
49	9
50	59
51	23
52	67
53	1
54	34
55	19
56	30
57	25
58	34
59	1
60	89
61	1
62	36
63	58
64	120
65	21
66	44
67	1
68	83
69	29
70	38
71	1
72	105

n	a(n)
1	0
2	1
3	1
4	4
5	1
6	2
7	1
8	11
9	5
10	10
11	1
12	9
13	1
14	12
15	11
16	26
17	1
18	9
19	1
20	15
21	13
22	16
23	1
24	28
25	7
26	18
27	18
28	15
29	1
30	32
31	1
32	57
33	17
34	22
35	15
36	35
37	1
38	24
39	19
40	32
41	1
42	36
43	1
44	59
45	48
46	28
47	1
48	71
49	9
50	59
51	23
52	67
53	1
54	34
55	19
56	30
57	25
58	34
59	1
60	89
61	1
62	36
63	58
64	120
65	21
66	44
67	1
68	83
69	29
70	38
71	1
72	105