a(n) = greatest prime less than prime(n)*prime(n+1).

Terms

a(0) =5a(1) =13a(2) =31a(3) =73a(4) =139a(5) =211a(6) =317a(7) =433a(8) =661a(9) =887a(10) =1129a(11) =1511a(12) =1759a(13) =2017a(14) =2477a(15) =3121a(16) =3593a(17) =4079a(18) =4751a(19) =5179a(20) =5749a(21) =6553a(22) =7369a(23) =8629a(24) =9791a(25) =10399a(26) =11003a(27) =11657a(28) =12301a(29) =14347