Numbers m such that the product of proper divisors of m = m^k, k>1.

Terms

a(0) =12a(1) =18a(2) =20a(3) =24a(4) =28a(5) =30a(6) =32a(7) =40a(8) =42a(9) =44a(10) =45a(11) =48a(12) =50a(13) =52a(14) =54a(15) =56a(16) =60a(17) =63a(18) =66a(19) =68a(20) =70a(21) =72a(22) =75a(23) =76a(24) =78a(25) =80a(26) =84a(27) =88a(28) =90a(29) =92