%I #6 Mar 30 2012 18:39:02
%S 6,36,386,5006,85086,1616616,37182146,1078282206,33426748356,
%T 1236789689136,50708377254536,2180460221945006,102481630431415236,
%U 5431526412865007456,320460058359035439846,19548063559901161830546
%N Smallest x > 1 such that x^prime(n) == 1 mod(prime(i)) 3<=i<=n.
%F a(n)=1+A002110(n)/6
%o (PARI) for(n=3,20,print1((prod(i=1,n, prime(i))+6)/6,","))
%K easy,nonn
%O 3,1
%A _Benoit Cloitre_, May 30 2002