Primes in A103372.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =17a(5) =31a(6) =71a(7) =157a(8) =257a(9) =349a(10) =641a(11) =769a(12) =3613a(13) =16763a(14) =233417a(15) =9540317a(16) =7391145211a(17) =139697883473a(18) =163069191377a(19) =562142600387