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%I #28 Jul 04 2021 07:53:14
%S 5,7,79,523,571,2837
%N Numbers k such that 17^k - 16^k is prime.
%C Terms greater than 1000 may only be strong pseudoprimes. [Clarified by _M. F. Hasler_, Sep 16 2013]
%C No other terms less than 100000. - _Robert Price_, Mar 22 2012
%o (PARI) is(n)=ispseudoprime(17^n-16^n) \\ _Charles R Greathouse IV_, May 22 2017
%Y Cf. A000043, A057468, A059801-A059803, A062572-A062582, A188051, A062585-A062666.
%K nonn,hard
%O 1,1
%A _Mike Oakes_, May 18 2001
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