Smallest prime factor of 2^(2^n+2) + 3.

Terms

a(0) =11a(1) =19a(2) =67a(3) =13a(4) =262147a(5) =13a(6) =1669a(7) =13a(8) =255127a(9) =13a(10) =2383a(11) =13a(12) =67a(13) =13a(14) =32544331a(15) =13a(16) =271a(17) =13a(18) =4057a(19) =13