Either 8th power of a prime, or product of a square and a cube of two different primes.

Terms

a(0) =72a(1) =108a(2) =200a(3) =256a(4) =392a(5) =500a(6) =675a(7) =968a(8) =1125a(9) =1323a(10) =1352a(11) =1372a(12) =2312a(13) =2888a(14) =3087a(15) =3267a(16) =4232a(17) =4563a(18) =5324a(19) =6125a(20) =6561a(21) =6728a(22) =7688a(23) =7803a(24) =8575a(25) =8788a(26) =9747a(27) =10952a(28) =11979a(29) =13448