%I

%S 3,7,97,109,401,431

%N Numbers n such that 26^n - 25^n is prime or a strong pseudoprime.

%C a(7) > 10^5 - _Robert Price_, Nov 10 2012

%Y Cf. A000043, A057468, A059801, A059802, A062572-A062589, A214658, A214655, A062593-A062666.

%K nonn,hard

%O 1,1

%A _Mike Oakes_, May 18 2001, May 19 2001

%E Edited by _M. F. Hasler_, Sep 21 2013