Numbers with exactly 6 divisors.

Terms

a(0) =12a(1) =18a(2) =20a(3) =28a(4) =32a(5) =44a(6) =45a(7) =50a(8) =52a(9) =63a(10) =68a(11) =75a(12) =76a(13) =92a(14) =98a(15) =99a(16) =116a(17) =117a(18) =124a(19) =147a(20) =148a(21) =153a(22) =164a(23) =171a(24) =172a(25) =175a(26) =188a(27) =207a(28) =212a(29) =236