a(n) is the smallest prime p such that p^2 divides n^(p-1) - 1.

Terms

a(0) =2a(1) =1093a(2) =11a(3) =1093a(4) =2a(5) =66161a(6) =5a(7) =3a(8) =2a(9) =3a(10) =71a(11) =2693a(12) =2a(13) =29a(14) =29131a(15) =1093a(16) =2a(17) =5a(18) =3a(19) =281a(20) =2a(21) =13a(22) =13a(23) =5a(24) =2a(25) =3a(26) =11a(27) =3a(28) =2a(29) =7