%I #5 Mar 30 2012 18:39:02
%S 4,16,106,1156,15016,255256,4849846,111546436,3234846616,100280245066,
%T 3710369067406,152125131763606,6541380665835016,307444891294245706,
%U 16294579238595022366,961380175077106319536,58644190679703485491636
%N Smallest x > 1 such that x^prime(n) == 1 mod(prime(i)) 2<=i<=n.
%F a(n)=(1/2)*(A006862(n)+1)
%K easy,nonn
%O 2,1
%A _Benoit Cloitre_, May 30 2002