If n = Product (p_j^k_j) then a(n) = Product (prime(p_j)^prime(k_j)).

Terms

a(0) =1a(1) =9a(2) =25a(3) =27a(4) =121a(5) =225a(6) =289a(7) =243a(8) =125a(9) =1089a(10) =961a(11) =675a(12) =1681a(13) =2601a(14) =3025a(15) =2187a(16) =3481a(17) =1125a(18) =4489a(19) =3267a(20) =7225a(21) =8649a(22) =6889a(23) =6075a(24) =1331a(25) =15129a(26) =3125a(27) =7803a(28) =11881a(29) =27225