a(n) is the smallest number with n divisors d such that sigma(d) / tau(d) is an integer.

Terms

a(0) =1a(1) =3a(2) =6a(3) =15a(4) =45a(5) =30a(6) =42a(7) =60a(8) =132a(9) =264a(10) =270a(11) =378a(12) =594a(13) =210a(14) =462a(15) =780a(16) =1050a(17) =420a(18) =924a(19) =660a(20) =2100a(21) =840a(22) =3060a(23) =1848a(24) =3300a(25) =1890a(26) =2970a(27) =2520a(28) =9702a(29) =2310