a(n) = smallest number > 1 such that a(1)a(2)...a(n) + 1 is prime.

Terms

a(0) =2a(1) =2a(2) =3a(3) =3a(4) =2a(5) =6a(6) =3a(7) =2a(8) =4a(9) =7a(10) =7a(11) =3a(12) =8a(13) =6a(14) =2a(15) =3a(16) =6a(17) =9a(18) =6a(19) =14a(20) =19a(21) =11a(22) =4a(23) =4a(24) =19a(25) =4a(26) =13a(27) =3a(28) =10a(29) =13