Multiply perfect numbers k such that sigma(k)/k > 2.

Terms

a(0) =120a(1) =672a(2) =30240a(3) =32760a(4) =523776a(5) =2178540a(6) =23569920a(7) =45532800a(8) =142990848a(9) =459818240a(10) =1379454720a(11) =1476304896a(12) =14182439040a(13) =31998395520a(14) =43861478400a(15) =51001180160a(16) =66433720320a(17) =153003540480a(18) =403031236608a(19) =518666803200