Numbers of the form p^q^r, for p,q,r primes.

Terms

a(0) =16a(1) =81a(2) =256a(3) =512a(4) =625a(5) =2401a(6) =6561a(7) =14641a(8) =19683a(9) =28561a(10) =83521a(11) =130321a(12) =279841a(13) =390625a(14) =707281a(15) =923521a(16) =1874161a(17) =1953125a(18) =2825761a(19) =3418801a(20) =4879681a(21) =5764801a(22) =7890481a(23) =12117361a(24) =13845841a(25) =20151121a(26) =25411681a(27) =28398241a(28) =33554432a(29) =38950081