a(n) is the smallest number k >= 1 that has exactly n divisors in A020487.

Terms

a(0) =1a(1) =4a(2) =16a(3) =36a(4) =256a(5) =100a(6) =200a(7) =576a(8) =400a(9) =800a(10) =2600a(11) =900a(12) =3200a(13) =1800a(14) =16900a(15) =6400a(16) =12800a(17) =3600a(18) =20800a(19) =7200a(20) =11700a(21) =36000a(22) =67600a(23) =14400a(24) =23400a(25) =28800a(26) =32400a(27) =88200a(28) =397800a(29) =64800