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%I #9 Jun 06 2017 14:35:02
%S 2,83,1907,2591,16223,17183
%N Numbers n such that (17^n - 2^n)/15 is prime.
%C All terms are primes.
%C a(7) > 10^5.
%t Select[ Prime[ Range[1, 100000] ], PrimeQ[ (17^# - 2^#)/15 ]& ]
%o (PARI) is(n)=ispseudoprime((17^n-2^n)/15) \\ _Charles R Greathouse IV_, Jun 06 2017
%Y Cf. A128031, A225955, A217320, A006034.
%K more,nonn
%O 1,1
%A _Robert Price_, Jul 29 2013