Numbers m such that phi(m) is a power of the product of the distinct prime factors of m.

Terms

a(0) =1a(1) =4a(2) =8a(3) =16a(4) =18a(5) =32a(6) =64a(7) =108a(8) =128a(9) =250a(10) =256a(11) =512a(12) =648a(13) =1024a(14) =2048a(15) =2500a(16) =3888a(17) =4096a(18) =6174a(19) =8192a(20) =16384a(21) =23328a(22) =25000a(23) =32768a(24) =41154a(25) =65536a(26) =101250a(27) =131072a(28) =139968a(29) =250000