Numbers m such that sigma(m)/m is equal to sigma(k)/k for some k being superabundant (A004394).

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =12a(5) =24a(6) =28a(7) =36a(8) =48a(9) =60a(10) =120a(11) =180a(12) =234a(13) =240a(14) =360a(15) =496a(16) =600a(17) =672a(18) =720a(19) =840a(20) =1170a(21) =1260a(22) =1680a(23) =1800a(24) =2016a(25) =2520a(26) =4200a(27) =5040a(28) =8128a(29) =10080