A348397 - cp's OEIS frontend

A348397 a(n) = Sum_{d|n} sigma_[n-d](d), where sigma_[k](n) is the sum of the k-th powers of the divisors of n.

n	a(n)
1	1
2	3
3	3
4	9
5	3
6	50
7	3
8	343
9	734
10	3388
11	3
12	133959
13	3
14	827646
15	10297073
16	33640713
17	3
18	2579172499
19	3
20	44822639761
21	678610493345
22	285312719194
23	3
24	393067887861756
25	95367431640630
26	302875123369476
27	150094918113956098
28	569940024192528003
29	3
30	105474401758856279784
31	3

[1, 3, 3, 9, 3, 50, 3, 343, 734, 3388, 3, 133959, 3, 827646, 10297073, 33640713, 3, 2579172499, 3, 44822639761, 678610493345, 285312719194, 3, 393067887861756, 95367431640630, 302875123369476, 150094918113956098, 569940024192528003, 3, 105474401758856279784, 3]

cp's OEIS Frontend

A348397 a(n) = Sum_{d|n} sigma_[n-d](d), where sigma_[k](n) is the sum of the k-th powers of the divisors of n.

Table of values

List of values