Numbers which are the minimum of a cycle in the map x -> phi(sigma(x)).

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =12a(5) =16a(6) =48a(7) =72a(8) =128a(9) =240a(10) =432a(11) =576a(12) =720a(13) =1200a(14) =1728a(15) =1800a(16) =6912a(17) =10368a(18) =15552a(19) =27648a(20) =32768a(21) =41472a(22) =67392a(23) =142560a(24) =184320a(25) =272160a(26) =326592a(27) =712800a(28) =1140480a(29) =1190400