The least prime dividing A000255(n); a(1) = 1.

Terms

a(0) =1a(1) =3a(2) =11a(3) =53a(4) =3a(5) =13a(6) =11a(7) =3a(8) =1468457a(9) =11a(10) =3a(11) =1373a(12) =34361893981a(13) =3a(14) =17713a(15) =2130617a(16) =3a(17) =11a(18) =13a(19) =3a(20) =11a(21) =617a(22) =3a(23) =37a(24) =11a(25) =3a(26) =179a(27) =14633a(28) =3a(29) =76463