Nontrivial nonunitary multiply perfect numbers: the sum of the nonunitary divisors of n is a positive multiple of n; i.e., (sigma(n) - usigma(n))/n is a positive integer.

A064595

Nontrivial nonunitary multiply perfect numbers: the sum of the nonunitary divisors of n is a positive multiple of n; i.e., (sigma(n) - usigma(n))/n is a positive integer.

Terms

    a(0) =24a(1) =112a(2) =1984a(3) =2520a(4) =31320a(5) =32512a(6) =1163160a(7) =2208384a(8) =3053232a(9) =6535296a(10) =13472928a(11) =123165600a(12) =134201344a(13) =186076800a(14) =365959296a(15) =3456573120a(16) =4401782352a(17) =5517818880a(18) =18924364800a(19) =34359476224a(20) =325377803520

External references