Smallest n-th power starting with 4.

Terms

a(0) =4a(1) =4a(2) =4096a(3) =4096a(4) =4084101a(5) =4096a(6) =4782969a(7) =43046721a(8) =40353607a(10) =4194304a(11) =4096a(13) =4782969a(14) =470184984576a(15) =43046721