Greater prime factor of semiprimes in A089539.

Terms

a(0) =2a(1) =2a(2) =3a(3) =5a(4) =11a(5) =103a(6) =71a(7) =661a(8) =72577a(9) =329891a(10) =13305601a(11) =4938161a(12) =75024347a(13) =3790360487a(14) =186810624001a(19) =117876683047