%I #18 Jul 04 2021 09:00:38
%S 3,7,1123,7489
%N Numbers k such that 59^k - 58^k is prime.
%C Terms greater than 1000 often correspond only to strong pseudoprimes. [Clarified by _M. F. Hasler_, Sep 15 2013]
%C a(5) > 10^5. - _Robert Price_, Jan 31 2013
%o (PARI) is(n)=ispseudoprime(59^n-58^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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