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%I #14 Jul 04 2021 09:01:39
%S 2,5,7,41,79,2957,9949
%N Numbers k such that 79^k - 78^k is prime.
%C Terms > 1000 are often only strong pseudoprimes.
%C a(8) > 10^5. - _Robert Price_, Nov 10 2014
%o (PARI) is(n)=ispseudoprime(79^n-78^n) \\ _Charles R Greathouse IV_, Jun 13 2017
%Y Cf. A000043, A057468, A059801, A059802, A062572-A062666.
%K nonn,hard
%O 1,1
%A _Mike Oakes_, May 18 2001, May 19 2001
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