Smallest odd number with same number of divisors as 3*a(n-1).

Terms

a(0) =1a(1) =3a(2) =9a(3) =15a(4) =45a(5) =105a(6) =315a(7) =945a(8) =2835a(9) =3465a(10) =10395a(11) =31185a(12) =45045a(13) =135135a(14) =405405a(15) =675675a(16) =2027025a(17) =3828825a(18) =11486475a(19) =34459425a(20) =72747675a(21) =218243025a(22) =654729075a(23) =1527701175a(24) =4583103525a(25) =11712375675a(26) =35137127025a(27) =105411381075