A129076 - cp's OEIS frontend

A129076 a(n) = sigma(sigma(sigma(sigma(n)))), where sigma(n) = sum of divisors of n.

n	a(n)
1	1
2	8
3	15
4	24
5	56
6	120
7	60
8	168
9	60
10	120
11	120
12	360
13	168
14	480
15	480
16	104
17	120
18	360
19	252
20	728
21	210
22	248
23	480
24	1512
25	104
26	728
27	546
28	1170
29	336
30	992
31	210
32	576
33	504
34	1170
35	504
36	480
37	480
38	1512
39	1170
40	1344
41	728
42	1680
43	504
44	1560
45	1512
46	992
47	504
48	1560
49	384
50	432
51	992
52	588

[1, 8, 15, 24, 56, 120, 60, 168, 60, 120, 120, 360, 168, 480, 480, 104, 120, 360, 252, 728, 210, 248, 480, 1512, 104, 728, 546, 1170, 336, 992, 210, 576, 504, 1170, 504, 480, 480, 1512, 1170, 1344, 728, 1680, 504, 1560, 1512, 992, 504, 1560, 384, 432, 992, 588]

cp's OEIS Frontend

A129076 a(n) = sigma(sigma(sigma(sigma(n)))), where sigma(n) = sum of divisors of n.

Table of values

List of values