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%I #15 Mar 12 2023 08:49:46
%S 3,7,13,19,307,619,2089,7297,75571,76103,98897
%N Numbers k such that (9^k + 8^k)/17 is prime.
%C All terms are prime.
%C a(12) > 10^5.
%t Select[ Prime[ Range[1, 100000] ], PrimeQ[ (9^# + 8^#)/17 ]& ]
%o (PARI) is(n)=isprime((9^n+8^n)/17) \\ _Charles R Greathouse IV_, Feb 17 2017
%Y Cf. A181141, A128339, A057175, A125956.
%K nonn,hard,more
%O 1,1
%A _Robert Price_, Dec 26 2012
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