Smallest prime of the form k*n! - 1.

Terms

a(0) =2a(1) =3a(2) =5a(3) =23a(4) =239a(5) =719a(6) =5039a(7) =201599a(8) =1088639a(9) =14515199a(10) =159667199a(11) =479001599a(12) =31135103999a(13) =87178291199