Multiply-perfect numbers that are the sum of the divisors of some number.

Terms

a(0) =1a(1) =6a(2) =28a(3) =120a(4) =496a(5) =672a(6) =30240a(7) =32760a(8) =523776a(9) =2178540a(10) =23569920a(11) =33550336a(12) =45532800a(13) =142990848a(14) =459818240a(15) =1379454720a(16) =1476304896a(17) =8589869056a(18) =14182439040a(19) =31998395520a(20) =43861478400a(21) =51001180160a(22) =66433720320a(23) =137438691328a(24) =153003540480a(25) =403031236608a(26) =518666803200