Smallest prime factor of prime(n)-th repunit number.

Terms

a(0) =11a(1) =3a(2) =41a(3) =239a(4) =21649a(5) =53a(6) =2071723a(9) =3191a(10) =2791a(11) =2028119a(12) =83a(13) =173a(14) =35121409a(15) =107a(17) =733a(18) =493121a(20) =12171337159