Multiply-perfect numbers k that have a divisor d such that sigma(d)*d = k.

A348031

Multiply-perfect numbers k that have a divisor d such that sigma(d)*d = k.

Terms

    a(0) =1a(1) =6a(2) =28a(3) =120a(4) =496a(5) =672a(6) =8128a(7) =30240a(8) =32760a(9) =523776a(10) =23569920a(11) =33550336a(12) =142990848a(13) =1379454720a(14) =8589869056a(15) =66433720320a(16) =137438691328a(17) =153003540480a(18) =403031236608

External references