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%I #17 Jul 04 2021 08:42:44
%S 2,7,139,383,1187,5857,41281
%N Numbers k such that 51^k - 50^k is prime.
%C Terms greater than 1000 are often only strong pseudoprimes.
%C a(8) > 10^5. - _Robert Price_, Feb 28 2013
%o (PARI) is(n)=ispseudoprime(51^n-50^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
%E a(7) from _Robert Price_, Feb 28 2013
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