Smallest x such that sigma(x)/x = 2*sigma(n)/n where sigma(n) is the sum of divisors of n.

Terms

a(0) =6a(1) =120a(2) =84a(3) =4320a(4) =30a(5) =30240a(6) =42a(7) =293760a(8) =252a(9) =3360a(10) =66a(11) =208565280a(12) =78a(13) =840a(14) =420a(15) =760320a(16) =102a(17) =18506880a(18) =114a(19) =131040a(20) =1890a(21) =1320a(22) =138a(23) =14182439040a(24) =150a(25) =1560a(26) =756a(27) =30240a(28) =174a(29) =668304000