The OEIS is supported by the many generous donors to the OEIS Foundation.
%I #14 Jul 04 2021 09:01:34
%S 19,101,5939
%N Numbers k such that 77^k - 76^k is prime.
%C Terms > 1000 are often only strong pseudoprimes.
%C a(4) > 10^5. - _Robert Price_, Sep 01 2014
%o (PARI) is(n)=ispseudoprime(77^n-76^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