a(n) is the smallest prime factor of (n-1)^n - n^(n-1).

Terms

a(0) =17a(1) =3a(2) =47a(3) =162287a(4) =23a(5) =257a(6) =2486784401a(7) =3a(8) =33479a(10) =5a(11) =67a(12) =7a(13) =3a(14) =443881a(15) =100417a(16) =859a(17) =79a(19) =3a(20) =92798617729a(21) =67a(22) =1627a(23) =11a(25) =3a(26) =19a(27) =241a(28) =167a(30) =5a(31) =3a(32) =47a(33) =5