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Numbers n such that 4^n + 9i is a Gaussian Prime.
0

%I #3 Mar 30 2012 18:55:37

%S 1,2,3,4,7,8,14,16,24,32,62,68,77,88,138,162,164,183,321,333,502,1613

%N Numbers n such that 4^n + 9i is a Gaussian Prime.

%C No more under 2000.

%t Flatten[Position[Table[PrimeQ[4^n + 9 I], {n, 1, 2000}], True]]

%K hard,nonn

%O 1,2

%A _Ed Pegg Jr_, May 29 2003