a(n) is the smallest number with exactly n divisors that are greater than or equal to 4.

Terms

a(0) =4a(1) =8a(2) =12a(3) =20a(4) =24a(5) =36a(6) =48a(7) =80a(8) =60a(9) =140a(10) =192a(11) =144a(12) =120a(13) =280a(14) =180a(15) =700a(16) =240a(17) =560a(18) =1600a(19) =5120a(20) =360a(21) =1120a(22) =10000a(23) =900a(24) =960a(25) =2240a(26) =720a(27) =2800a(28) =840a(29) =3080