A062835 - cp's OEIS frontend

A062835 a(1) = 0; for n > 1 a(n) = sum of divisors of n^2-1; or sigma(A005563(n-1)).

n	a(n)
1	0
2	4
3	15
4	24
5	60
6	48
7	124
8	104
9	186
10	156
11	360
12	168
13	480
14	336
15	504
16	432
17	819
18	360
19	1170
20	640
21	1080
22	768
23	1488
24	744
25	1736
26	1240
27	1680
28	1200
29	2880
30	960
31	3048
32	1536
33	2286
34	2304
35	3510
36	1824
37	3900
38	2128
39	3720
40	2352
41	5952
42	1848
43	5760
44	3432
45	4320
46	3744
47	6048

[0, 4, 15, 24, 60, 48, 124, 104, 186, 156, 360, 168, 480, 336, 504, 432, 819, 360, 1170, 640, 1080, 768, 1488, 744, 1736, 1240, 1680, 1200, 2880, 960, 3048, 1536, 2286, 2304, 3510, 1824, 3900, 2128, 3720, 2352, 5952, 1848, 5760, 3432, 4320, 3744, 6048]

cp's OEIS Frontend

A062835 a(1) = 0; for n > 1 a(n) = sum of divisors of n^2-1; or sigma(A005563(n-1)).

Table of values

List of values