Perfect powers whose digits are in nonincreasing order.

Terms

a(0) =1a(1) =4a(2) =8a(3) =9a(4) =32a(5) =64a(6) =81a(7) =100a(8) =400a(9) =441a(10) =841a(11) =900a(12) =961a(13) =1000a(14) =6400a(15) =7744a(16) =7776a(17) =8000a(18) =8100a(19) =10000a(20) =40000a(21) =44100a(22) =64000a(23) =84100a(24) =90000a(25) =96100a(26) =100000a(27) =640000a(28) =774400a(29) =810000