%I #11 Apr 16 2013 12:14:03

%S 3,23,4297,20831323

%N a(n) = smallest prime p such that p + prime(n)# is next prime after p, where primorial prime(n)# = 2*3*..*prime(n).

%C a(5) > 10^20.

%F a(n) = A000230(A002110(n)/2).

%e a(2)=23 because 23 is smallest prime such that 23+2*3=29 is next prime.

%Y Cf. A001223, A000230.

%K nonn,hard,more

%O 1,1

%A _Thomas Ordowski_, Apr 16 2013