a(n) is the least number with exactly n divisors of the form 3*k+1.

Terms

a(0) =1a(1) =4a(2) =16a(3) =28a(4) =80a(5) =112a(6) =320a(7) =280a(8) =784a(9) =560a(10) =1600a(11) =1120a(12) =10000a(13) =2240a(14) =3920a(15) =2800a(16) =25600a(17) =5600a(18) =1310720a(19) =6160a(20) =15680a(21) =11200a(22) =48400a(23) =12320a(24) =110000a(25) =70000a(26) =39200a(27) =24640a(28) =6553600a(29) =30800