Numbers m with a divisor d satisfying sigma(d) = 2*m.

Terms

a(0) =6a(1) =28a(2) =496a(3) =8128a(4) =60480a(5) =65520a(6) =4357080a(7) =33550336a(8) =47139840a(9) =91065600a(10) =285981696a(11) =2758909440a(12) =8589869056a(13) =87722956800a(14) =132867440640a(15) =137438691328a(16) =306007080960a(17) =806062473216