A066289 - cp's OEIS frontend

A066289 Numbers k such that k divides DivisorSigma(2*j-1, k) for all j; i.e., all odd-power-sums of divisors of k are divisible by k.

n	a(n)
1	1
2	6
3	120
4	672
5	30240
6	32760
7	31998395520
8	796928461056000
9	212517062615531520
10	680489641226538823680000
11	13297004660164711617331200000
12	1534736870451951230417633280000
13	6070066569710805693016339910206758877366156437562171488352958895095808000000000

[1, 6, 120, 672, 30240, 32760, 31998395520, 796928461056000, 212517062615531520, 680489641226538823680000, 13297004660164711617331200000, 1534736870451951230417633280000, 6070066569710805693016339910206758877366156437562171488352958895095808000000000]

cp's OEIS Frontend

A066289 Numbers k such that k divides DivisorSigma(2*j-1, k) for all j; i.e., all odd-power-sums of divisors of k are divisible by k.

Table of values

List of values