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%I #16 Jul 04 2021 09:02:26
%S 179,479
%N Numbers k such that 85^k - 84^k is prime.
%C Terms greater than 1000 are often only strong pseudoprimes.
%C a(3) > 10^5. - _Robert Price_, Mar 26 2015
%o (PARI) is(n)=ispseudoprime(85^n-84^n) \\ _Charles R Greathouse IV_, Jun 13 2017
%Y Cf. A000043, A057468, A059801, A059802, A062572-A062666.
%K nonn,hard,bref
%O 1,1
%A _Mike Oakes_, May 18 2001, May 19 2001
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