Boundaries of primorial intervals [1,3]; [3,9],[9,15]; [15,45], etc.

Terms

a(0) =1a(1) =3a(2) =9a(3) =15a(4) =45a(5) =75a(6) =105a(7) =315a(8) =525a(9) =735a(10) =945a(11) =1155a(12) =3465a(13) =5775a(14) =8085a(15) =10395a(16) =12705a(17) =15015a(18) =45045a(19) =75075a(20) =105105a(21) =135135a(22) =165165a(23) =195195a(24) =225225a(25) =255255a(26) =765765a(27) =1276275a(28) =1786785a(29) =2297295