Smallest prime factor of n! + 2^n - 1.

Terms

a(0) =2a(1) =5a(2) =13a(3) =3a(4) =151a(5) =3a(6) =5167a(7) =3a(8) =7a(9) =3a(10) =39918847a(11) =3a(12) =17a(13) =3a(14) =7a(15) =3a(16) =829a(17) =3a(18) =25561a(19) =3a(20) =7a(21) =3a(22) =929a(23) =3a(24) =67a(25) =3a(26) =7a(27) =3a(28) =37a(29) =3