a(n) is the least number k that has exactly n divisors <= sqrt(k) of the form 4*j+3.

Terms

a(0) =1a(1) =9a(2) =63a(3) =231a(4) =945a(5) =1890a(6) =3465a(7) =5775a(8) =12285a(9) =10395a(10) =20790a(11) =60060a(12) =45045a(13) =75075a(14) =98175a(15) =103950a(16) =176715a(17) =135135a(18) =225225a(19) =270270a(20) =405405a(21) =900900a(22) =1060290a(23) =810810a(24) =765765a(25) =675675a(26) =1354815a(27) =1351350a(28) =1711710a(29) =2702700