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Numbers n such that (10^n-1)^2-2 is prime.
3

%I #9 Feb 19 2016 08:40:58

%S 1,8,21,123,4299,6128,11760,18884,40293

%N Numbers n such that (10^n-1)^2-2 is prime.

%C Next term > 70000.

%H S. Harvey, <a href="http://harvey563.tripod.com/Carol_Kynea.txt">Carol and Kynea Primes</a>.

%o (PARI) is(n)=ispseudoprime((10^n-1)^2-2) \\ _Charles R Greathouse IV_, Feb 19 2016

%K nonn,more

%O 1,2

%A _Ray Chandler_, Nov 21 2004