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%I #20 Jul 04 2021 09:02:28
%S 2,41,67,7699,12409
%N Numbers k such that 84^k - 83^k is prime.
%C Terms greater than 1000 are often only strong pseudoprimes.
%C a(6) > 20000. - _Derek Orr_, Sep 22 2014
%C a(6) > 10^5. - _Robert Price_, Mar 05 2015
%o (PARI) is(n)=ispseudoprime(84^n-83^n) \\ _Charles R Greathouse IV_, Jun 13 2017
%Y Cf. A000043, A057468, A059801, A059802, A062572-A062666.
%K nonn,hard,more
%O 1,1
%A _Mike Oakes_, May 18 2001, May 19 2001
%E a(5) from _Derek Orr_, Sep 22 2014
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