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(7^n)-th prime.
1

%I #14 Feb 13 2015 13:09:49

%S 2,17,227,2309,21391,185707,1549817,12579617,100061641,783765347,

%T 6065997263,46498768471,353628459043,2671659677783,20071277607583,

%U 150061721792537,1117220967868039,8287149196682591,61270583418289577,451682554201973687,3321076175415205093

%N (7^n)-th prime.

%t Table[ Prime[ 7^n ], {n, 0, 14} ]

%o (PARI) a(n)=prime(7^n) \\ _Charles R Greathouse IV_, Nov 02 2014

%K nonn,hard

%O 0,1

%A _Robert G. Wilson v_, Dec 04 2000

%E a(15)-a(20) from _Charles R Greathouse IV_, Nov 02 2014