Numbers with 7 divisors. 6th powers of primes.

Terms

a(0) =64a(1) =729a(2) =15625a(3) =117649a(4) =1771561a(5) =4826809a(6) =24137569a(7) =47045881a(8) =148035889a(9) =594823321a(10) =887503681a(11) =2565726409a(12) =4750104241a(13) =6321363049a(14) =10779215329a(15) =22164361129a(16) =42180533641a(17) =51520374361a(18) =90458382169a(19) =128100283921