Least prime factor of Sum_{k=0..n-1} n^k.

Terms

a(0) =3a(1) =13a(2) =5a(3) =11a(4) =7a(5) =29a(6) =3a(7) =7a(8) =11a(9) =15797a(10) =5a(11) =53a(12) =3a(13) =11a(14) =17a(15) =10949a(16) =7a(18) =3a(19) =43a(20) =23a(21) =461a(22) =5a(23) =11a(24) =3a(25) =109a(26) =5a(27) =59a(28) =7a(30) =3a(31) =67