a(n) is the smallest number k such that k*2^(2^n) + 1 is prime.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =18a(6) =12a(7) =21a(8) =102a(9) =202a(10) =826a(11) =708a(12) =502a(13) =1522a(14) =6223a(15) =3493a(16) =1063a(17) =50655a(18) =10051a(19) =328426