A344787 - cp's OEIS frontend

A344787 a(n) = n * Sum_{d|n} sigma_d(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	7
3	31
4	287
5	3131
6	47527
7	823551
8	16843583
9	387440266
10	10009772937
11	285311670623
12	8918294639219
13	302875106592267
14	11112685050294387
15	437893920912795941
16	18447025553014982271
17	827240261886336764195
18	39346558271492953948522
19	1978419655660313589123999

[1, 7, 31, 287, 3131, 47527, 823551, 16843583, 387440266, 10009772937, 285311670623, 8918294639219, 302875106592267, 11112685050294387, 437893920912795941, 18447025553014982271, 827240261886336764195, 39346558271492953948522, 1978419655660313589123999]

cp's OEIS Frontend

A344787 a(n) = n * Sum_{d|n} sigma_d(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