Nonunitary doubly perfect numbers: the sum of the nonunitary divisors of n is 2n; i.e., sigma(n) - usigma(n) = 2n.
A064592
Nonunitary doubly perfect numbers: the sum of the nonunitary divisors of n is 2n; i.e., sigma(n) - usigma(n) = 2n.
Terms
- a(0) =2520a(1) =31320a(2) =1163160a(3) =2208384a(4) =3053232a(5) =6535296a(6) =13472928a(7) =123165600a(8) =365959296a(9) =4401782352a(10) =5517818880a(11) =612014161920
External references
- oeis: A064592