A161857 - cp's OEIS frontend

A161857 a(n) is the sum of the first column of the difference table of the divisors of n.

n	a(n)
1	1
2	2
3	3
4	3
5	5
6	4
7	7
8	4
9	7
10	4
11	11
12	4
13	13
14	4
15	11
16	5
17	17
18	12
19	19
20	-3
21	13
22	4
23	23
24	-4
25	21
26	4
27	15
28	3
29	29
30	38
31	31
32	6
33	17
34	4
35	31
36	-5
37	37
38	4
39	19
40	-42
41	41
42	76
43	43
44	15
45	27
46	4
47	47
48	-66
49	43
50	-4
51	23
52	21
53	53
54	68
55	43
56	34
57	25
58	4
59	59
60	-434
61	61
62	4
63	9
64	7
65	49
66	60
67	67
68	33
69	29
70	-54
71	71
72	24
73	73
74	4
75	59
76	39
77	69

[1, 2, 3, 3, 5, 4, 7, 4, 7, 4, 11, 4, 13, 4, 11, 5, 17, 12, 19, -3, 13, 4, 23, -4, 21, 4, 15, 3, 29, 38, 31, 6, 17, 4, 31, -5, 37, 4, 19, -42, 41, 76, 43, 15, 27, 4, 47, -66, 43, -4, 23, 21, 53, 68, 43, 34, 25, 4, 59, -434, 61, 4, 9, 7, 49, 60, 67, 33, 29, -54, 71, 24, 73, 4, 59, 39, 69]

cp's OEIS Frontend

A161857 a(n) is the sum of the first column of the difference table of the divisors of n.

Table of values

List of values