Smallest number having exactly s divisors, where s is the n-th semiprime (A001358).

Terms

a(0) =6a(1) =12a(2) =36a(3) =48a(4) =192a(5) =144a(6) =576a(7) =3072a(8) =1296a(9) =12288a(10) =9216a(11) =196608a(12) =5184a(13) =786432a(14) =36864a(15) =12582912a(16) =46656a(17) =589824a(18) =82944a(19) =2359296a(20) =805306368a(21) =3221225472a(22) =331776a(23) =37748736a(24) =206158430208a(25) =746496a(27) =5308416a(29) =2415919104a(30) =2985984a(31) =9663676416