Perfect powers using only composite digits 4,6,8,9 and 0.

Terms

a(0) =4a(1) =8a(2) =9a(3) =49a(4) =64a(5) =400a(6) =484a(7) =900a(8) =4096a(9) =4489a(10) =4900a(11) =6084a(12) =6400a(13) =6889a(14) =8000a(15) =8464a(16) =8649a(17) =9409a(18) =9604a(19) =40000a(20) =40804a(21) =44944a(22) =48400a(23) =64000a(24) =64009a(25) =66049a(26) =68644a(27) =69696a(28) =80089a(29) =88804