Composite numbers to composite powers.

Terms

a(0) =256a(1) =1296a(2) =4096a(3) =6561a(4) =10000a(5) =20736a(6) =38416a(7) =46656a(8) =50625a(9) =65536a(10) =104976a(11) =160000a(12) =194481a(13) =234256a(14) =262144a(15) =331776a(16) =390625a(17) =456976a(18) =531441a(19) =614656a(20) =810000a(21) =1000000a(22) =1048576a(23) =1185921a(24) =1336336a(25) =1500625a(26) =1679616a(27) =2085136a(28) =2313441