4-full numbers that are not prime powers.

Terms

a(0) =1296a(1) =2592a(2) =3888a(3) =5184a(4) =7776a(5) =10000a(6) =10368a(7) =11664a(8) =15552a(9) =20000a(10) =20736a(11) =23328a(12) =31104a(13) =34992a(14) =38416a(15) =40000a(16) =41472a(17) =46656a(18) =50000a(19) =50625a(20) =62208a(21) =69984a(22) =76832a(23) =80000a(24) =82944a(25) =93312a(26) =100000a(27) =104976a(28) =124416a(29) =139968