Startorial primes.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =23a(5) =719a(6) =5039a(7) =1451521a(8) =2903041a(9) =5806081a(10) =46448639a(11) =92897281a(12) =371589121a(13) =10032906239a(14) =30098718719a(15) =270888468479a(16) =812665405439