A329881 - cp's OEIS frontend

A329881 Nonunitary doubly superperfect numbers: numbers k such that nusigma(nusigma(k)) = 2*k, where nusigma(k) = sigma(k) - usigma(k) is the sum of nonunitary divisors of k (A048146).

n	a(n)
1	4032
2	13104
3	58032
4	69648
5	237744
6	278592
7	365652
8	1114368
9	15333552
10	71319552
11	245364912
12	981465264
13	1141112832
14	4564451328
15	873139150710
16	4020089387184

[4032, 13104, 58032, 69648, 237744, 278592, 365652, 1114368, 15333552, 71319552, 245364912, 981465264, 1141112832, 4564451328, 873139150710, 4020089387184]

cp's OEIS Frontend

A329881 Nonunitary doubly superperfect numbers: numbers k such that nusigma(nusigma(k)) = 2*k, where nusigma(k) = sigma(k) - usigma(k) is the sum of nonunitary divisors of k (A048146).

Table of values

List of values